CN216719131U - Optical sensor, biological characteristic information identification module and electronic equipment - Google Patents
Optical sensor, biological characteristic information identification module and electronic equipment Download PDFInfo
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Abstract
The embodiment of the application provides an optical sensor, a biological characteristic information identification module and electronic equipment. The optical sensor specifically includes: a substrate; the photoelectric sensing array is arranged on the substrate and comprises a plurality of photoelectric sensing units; and the light adjusting structure is arranged on one side of the light sensing surfaces of the photoelectric sensing units and is used for adjusting the light intensity of the light signals incident to the photoelectric sensing units so that the light intensity of the light signals received by at least two photoelectric sensing units is different. In the embodiment of the application, the light intensity of the optical signal received by the photoelectric sensing unit can be adjusted according to actual conditions so as to obtain a biological characteristic information image with relatively uniform brightness, and the accuracy of biological characteristic information identification is improved.
Description
Technical Field
The application belongs to the technical field of biological identification, and particularly relates to an optical sensor, a biological characteristic information identification module and an electronic device.
Background
With the rapid development of the electronic industry, the functions of electronic devices are becoming more and more powerful. In recent years, biometric identification techniques, such as biometric information identification and palm print identification, have been widely used in electronic devices to increase the intelligence of electronic devices. Specifically, an optical sensor for acquiring a biometric information image is usually disposed in the biometric information recognition module, and an unlocking function can be realized by acquiring and comparing the biometric information image.
However, when the existing optical sensor collects the biological characteristic information image, the defect of uneven brightness of the image is easy to occur, and the accuracy of biological characteristic information identification is reduced.
SUMMERY OF THE UTILITY MODEL
The application aims at providing an optical sensor, a biological characteristic information identification module and an electronic device, so as to solve the problem that the brightness of a biological characteristic information image is uneven when the existing optical sensor collects the biological characteristic information image.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, the present application discloses an optical sensor comprising:
a substrate;
the photoelectric sensing array is arranged on the substrate and comprises a plurality of photoelectric sensing units; and
the light adjusting structure is arranged on one side of the photosensitive surfaces of the photoelectric sensing units and used for adjusting the light intensity of the light signals incident to the photoelectric sensing units so that at least two photoelectric sensing units receive the light signals with different light intensities.
Optionally, the light intensity of the light signal received by the photo-sensing unit in the central region of the photo-sensing array is smaller than the light intensity of the light signal received by the photo-sensing unit in the edge region of the photo-sensing array.
Optionally, the light intensity of the optical signal received by the photoelectric sensing unit increases along a direction from the center of the photoelectric sensing array to the edge of the photoelectric sensing array.
Optionally, a light-shielding layer is further disposed on one side of the light-sensing surface of the photoelectric sensing unit, and the light-shielding layer is provided with a plurality of light-transmitting holes corresponding to the photoelectric sensing unit;
the light adjusting structure is arranged inside the light shielding layer, or the light adjusting structure is arranged above or below the light shielding layer.
Optionally, the light ray adjusting structure includes the light-transmitting hole inside the light-shielding layer;
the cross-sectional area of the light-transmitting hole increases along the direction from the center of the light-shielding layer to the edge of the light-shielding layer.
Optionally, the light hole located in the center of the light shielding layer is a first light hole, the cross-sectional area of the first light hole is a first cross-sectional area, the light hole located at the edge of the light shielding layer is a second light hole, and the cross-sectional area of the second light hole is a second cross-sectional area;
a ratio of the first cross-sectional area to the second cross-sectional area is less than or equal to a first target threshold.
Optionally, the first target threshold is 0.8.
Optionally, the light shielding layer comprises a plurality of sub-light shielding layers;
the cross section area of the light holes in at least one sub-shading layer increases along the direction from the center of the shading layer to the edge of the shading layer;
along the direction from the top to the bottom of the light shielding layer, the centers of the light holes on the sub light shielding layer are aligned, and the aperture of the light holes on the sub light shielding layer is decreased progressively.
Optionally, the light ray adjusting structure includes a microlens layer disposed above the light shielding layer, the microlens layer includes a plurality of microlenses, and the microlenses correspond to the light holes.
Optionally, the arch height of the microlenses increases in a direction from the center of the microlens layer to the edge of the microlens layer.
Optionally, the microlens located at the center of the microlens layer is a first microlens, the arch height of the first microlens is a first arch height, the microlens located at the edge of the microlens layer is a second microlens, and the arch height of the second microlens is a second arch height; wherein,
a ratio of the first camber to the second camber is less than or equal to a second target threshold.
Optionally, the second target threshold is 0.5.
Optionally, the microlenses are disposed only over an edge region of the light-shielding layer.
Optionally, the material of the light shielding layer is selected from: at least one of molybdenum, aluminum and copper.
Optionally, the light regulating structure comprises a first light transmissive layer disposed over the photosensor array;
the light transmittance of the first light-transmitting layer increases in a direction from the center of the first light-transmitting layer to the edge of the first light-transmitting layer.
Optionally, the thickness of the first light-transmitting layer decreases in a direction from the center of the first light-transmitting layer to the edge of the first light-transmitting layer.
Optionally, the first light-transmitting layer is made of a doped material; wherein,
the doping material of the central area of the first light-transmitting layer is different from that of the edge area.
In a second aspect, the present application further discloses a biometric information recognition module, which includes: a light directing structure and an optical sensor as described in any of the above; wherein,
the light guide structure is disposed above the optical sensor.
Optionally, the biometric information identification module further comprises a second light-transmitting layer, and the second light-transmitting layer is located between the light guide structure and the optical sensor, or the second light-transmitting layer is located above the light guide structure; wherein,
the light transmittance of the second light-transmitting layer increases in a direction from the center of the second light-transmitting layer to the edge of the second light-transmitting layer.
In a third aspect, the present application also discloses an electronic device, including: a display panel and any one of the biometric information identification modules; wherein,
the biological characteristic information identification module is arranged below the display panel.
In the embodiment of the application, can the photosurface one side of the photoelectric sensing unit of biological characteristic information identification module sets up light and adjusts the structure, light is transferred the structure and can be used for adjusting the incidence extremely the light intensity of the light signal of photoelectric sensing unit makes at least two the photoelectric sensing unit receives the light intensity of light signal is different. Therefore, the light intensity of the optical signal received by the photoelectric sensing unit can be adjusted according to the actual situation so as to obtain a biological characteristic information image with uniform brightness, and the accuracy of biological characteristic information identification is improved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of an optical sensor according to an embodiment of the present application;
FIG. 2 is a prior art RI graph of a biometric information image acquired by an optical sensor;
FIG. 3 is a schematic diagram of another optical sensor according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of another optical sensor according to an embodiment of the present application;
FIG. 5 is a second schematic structural diagram of another optical sensor according to an embodiment of the present application;
FIG. 6 is a third schematic structural diagram of another optical sensor according to an embodiment of the present application;
FIG. 7 is a fourth schematic structural diagram of another optical sensor according to an embodiment of the present application;
reference numerals are as follows: 10-substrate, 11-photoelectric sensing unit, 12-light shielding layer, 121-light transmitting hole, 13-microlens and 14-first light transmitting layer.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of those features. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Biometric technology has been widely applied to various terminal devices or electronic apparatuses. Biometric identification techniques include, but are not limited to, fingerprint identification, palm print identification, vein identification, iris identification, face identification, biometric identification, anti-counterfeiting identification, and the like. Among them, biometric information identification generally includes optical biometric information identification, capacitive biometric information identification, and ultrasonic biometric information identification. With the rise of the full screen technology, the biological characteristic information identification module can be arranged in a local area or a whole area below the display screen, so as to form Under-screen (Under-display) optical biological characteristic information identification; alternatively, a part or all of the optical biometric information identification module may be integrated into a display screen of the electronic device, so as to form In-screen (In-display) optical biometric information identification. The Display screen may be an Organic Light Emitting Diode (OLED) Display screen or a Liquid Crystal Display (LCD) screen, or the like. The biometric information recognition method generally includes the steps of biometric information image acquisition, preprocessing, feature extraction, feature matching and the like. Part or all of the steps can be realized by a traditional Computer Vision (CV) algorithm, and also can be realized by an Artificial Intelligence (AI) based deep learning algorithm. The biometric information identification technology can be applied to portable or mobile terminals such as smart phones, tablet computers and game equipment, and other electronic equipment such as smart door locks, automobiles and bank automatic teller machines, and is used for biometric information unlocking, biometric information payment, biometric information attendance, identity authentication and the like.
The embodiment of the application provides an optical sensor which can be used for identifying biological characteristic information. In particular, the optical sensor may be used to capture images of biometric information. The biometric information includes: fingerprint, palm print, finger vein, heart rate, blood, etc. Fingerprint identification is used as an example below, and other biometric identification is similar to this.
Referring to fig. 1, a schematic structural diagram of an optical sensor according to an embodiment of the present application is shown, and as shown in fig. 1, the optical sensor may specifically include:
a substrate 10;
a photo-sensing array disposed on the substrate 10, which may include a plurality of photo-sensing units 11; and
the light adjusting structure is arranged on one side of the light sensing surfaces of the photoelectric sensing units 11 and can be used for adjusting the light intensity of light signals incident to the photoelectric sensing units 11, so that the light intensity of the light signals received by at least two photoelectric sensing units 11 is different.
In the embodiment of the present application, the light adjusting structure may be disposed on one side of the photosensitive surface of the photoelectric sensing unit 11, and the light adjusting structure may be configured to adjust the light intensity of the light signal incident to the photoelectric sensing unit 11, so that at least two photoelectric sensing units 11 receive the light signal with different light intensities.
In the prior art, a light guide structure is usually disposed above the optical sensor, and because the light guide structure guides the light signals unevenly, after the light signals pass through the light guide structure, the intensity of the light signals incident to the photoelectric sensing units 11 at different positions has a difference, and by adjusting the intensity of the light signals incident to the photoelectric sensing units 11 by the light adjustment structure, the intensity difference of the light signals finally incident to the photoelectric sensing units 11 at different positions can be reduced. Therefore, by adjusting the light intensity of the optical signal received by the photoelectric sensing unit 11, the optical sensor can obtain a biological characteristic information image with relatively uniform brightness, and the accuracy of biological characteristic information identification is improved.
In the embodiment of the present application, the light ray adjusting structure may adjust the intensity of the light signal incident on the photoelectric sensing unit 11, specifically, adjust the incident light amount of the light signal incident on the photoelectric sensing unit 11. Specifically, the intensity of the optical signal is increased as the amount of light entering the photoelectric sensing unit 11 increases.
Specifically, the optical signal may be a full-band optical signal, or may be an optical signal passing through a partial band, for example, the optical signal in the band is used for biometric information identification, or may be an optical signal filtered by a filter. The embodiment of the present application may not limit the specific type of the optical signal.
Specifically, the substrate 10 may serve as a structural body of the optical sensor for supporting a photoelectric sensing array and the like in the optical sensor. The substrate 10 may be a rigid substrate made of glass or the like, or a flexible substrate made of a flexible material such as Polyimide (PI). The photoelectric sensing array may include a plurality of photoelectric sensing units 11 distributed in an array, the array may include a plurality of rows and a plurality of columns, and the rows may be arranged in a staggered manner, and the columns may be arranged in a staggered manner. The photo-sensing unit 11 may be configured to receive the optical signal and convert the optical signal into an electrical signal to form a biometric information image. The photo sensor unit 11 may be provided with a photosensitive surface, which may specifically be a surface of the photo sensor unit 11 for receiving optical signals.
For example, the photo-sensing unit 11 may be a photo-transistor, a photo-multiplier, a photo-resistor, a photo-diode, a photo-transistor, etc., and the embodiment of the present application may not be limited to a specific type of the photo-sensing unit 11.
In practical applications, the optical guiding structure of the biometric information recognition module usually adopts the principle of lens imaging to obtain a biometric information image. The biological characteristic information image formed by lens imaging is easy to have the phenomenon of uneven brightness, namely, the brightness of partial areas of the biological characteristic information image is lower than that of other areas. In the embodiment of the present application, by providing the light adjusting structure in the optical sensor, the light adjusting structure can be used to adjust the light intensity of the optical signal received by the photoelectric sensing unit 11. In practical applications, the higher the light intensity of the light signal received by the photoelectric sensing unit 11 is, the higher the brightness of the biometric information image formed by the photoelectric sensing unit 11 is, so that the purpose of adjusting the brightness of the biometric information image formed by the photoelectric sensing unit 11 can be achieved by adjusting the light intensity of the light signal received by the photoelectric sensing unit 11.
For example, the light adjusting structure may decrease the light intensity of the light signal received by the photo-sensing unit 11 in the area with higher brightness, and increase the light intensity of the light signal received by the photo-sensing unit 11 in the area with lower brightness, so that the brightness of the biometric information image formed by the photo-sensing units 11 in the entire area of the photo-sensing array may be more uniform.
Referring to fig. 2, an RI graph of a biometric information image acquired by an optical sensor is shown, wherein an origin of coordinates represents a center of the biometric information image acquired by the optical sensor, an abscissa represents a distance from the center of the biometric information image, and an ordinate represents a corresponding brightness. As shown in fig. 2, the farther the distance from the center of the biometric information image, the lower the brightness of the biometric information image. That is, the biometric information image obtained by the existing optical sensor shows the characteristics of bright center and dark edge.
In an alternative embodiment of the present application, the light intensity of the light signal incident to the photo-sensing units 11 is adjusted by the light adjusting structure, so that the light intensity of the light signal received by the photo-sensing units 11 in the central area of the photo-sensing array is smaller than the light intensity of the light signal received by the photo-sensing units 11 in the edge area of the photo-sensing array. Therefore, the brightness of the biological characteristic information image formed by the photoelectric sensing units 11 in the central area of the photoelectric sensing array is reduced, the brightness of the biological characteristic information image formed by the edge area of the photoelectric sensing array is increased, and the brightness difference between the central area and the edge area of the biological characteristic information image formed by the photoelectric sensing array is reduced, so that the biological characteristic information image with uniform brightness is obtained, and the accuracy of biological characteristic information identification is improved.
As shown in fig. 2, in the prior art, the brightness of the biometric information image tends to decrease in the direction from the center of the biometric information image to the edge. In an alternative embodiment of the present application, the light intensity of the optical signal received by the photo sensor unit 11 may be increased along the direction from the center of the photo sensor array to the edge of the photo sensor array. In this way, when the optical sensor is combined with the light guide structure for imaging, after passing through the light ray adjusting mechanism, the light intensity of the light signal received by the photoelectric sensing unit 11 with high image brightness in fig. 2 can be reduced, the light intensity of the light signal received by the photoelectric sensing unit 11 with low image brightness can be increased, and the brightness difference of the images formed by the photoelectric sensing units 11 at different positions in the light needle sensing array can be reduced. Therefore, the brightness of the image formed by the photoelectric sensing units 11 in the photoelectric sensing array can be more uniform, and a biological characteristic information image with more uniform brightness can be obtained.
In some optional embodiments of the present application, a light shielding layer 12 may be further disposed on a side of the light sensing surface of the photoelectric sensing unit 11, and the light shielding layer 12 is provided with a plurality of light holes 121, where the light holes 121 correspond to the photoelectric sensing unit 11. Specifically, the light shielding layer 12 may be made of a material capable of shielding light, such as black ink or a black coating, or may be made of a metal material, such as molybdenum, aluminum, or copper, or may be made of light shielding foam, and the specific material of the light shielding layer 12 is not limited in the embodiment of the present application. The light-shielding layer 12 may be provided with a light-transmitting hole 121 at a position corresponding to the photoelectric sensing unit 11, and the optical signal may be incident on the photoelectric sensing unit 11 through the light-transmitting hole 121 and received by the photoelectric sensing unit 11.
In practical application, when the plurality of photoelectric sensing units 11 are included in the photoelectric sensing array, the light shielding layer 12 is disposed on one side of the light sensing surface of the photoelectric sensing unit 11, and the light transmission holes 121 corresponding to the photoelectric sensing units 11 are disposed on the light shielding layer 12, so that external optical signals can be incident on the corresponding photoelectric sensing units 11 only through the light transmission holes 121, and thus, light crosstalk between adjacent photoelectric sensing units 11 can be avoided, and the quality of biological characteristic information images obtained by the photoelectric sensors can be improved.
In some optional embodiments of the present application, the light adjusting structure may be disposed inside the light shielding layer 12, or the light adjusting structure may be disposed above or below the light shielding layer 12.
For example, when the photoelectric adjustment structure is disposed inside the light shielding layer 12, the photoelectric adjustment structure inside the light shielding layer 12 can adjust the light intensity of the optical signal when the optical signal passes through the light shielding layer 12, so as to adjust the light intensity incident on the photoelectric sensing unit 11.
For another example, when the photoelectric adjustment structure is disposed above the light shielding layer 12, when an optical signal passes through the photoelectric adjustment structure, the light quantity of the optical signal is adjusted by the photoelectric adjustment structure, and then enters the corresponding photoelectric sensing unit 11 through the light-transmitting hole 121 on the light shielding layer 12, so as to achieve the purpose of adjusting the light intensity incident on the photoelectric sensing unit 11.
For another example, in the case that the photoelectric adjusting structure is disposed below the light shielding layer 12, the light signal enters the light ray adjusting structure after passing through the light-transmitting hole 121 on the light shielding layer 12, and the light quantity of the light signal is adjusted by the photoelectric adjusting structure and then enters the corresponding photoelectric sensing unit 11, so as to achieve the purpose of adjusting the light intensity incident to the photoelectric sensing unit 11.
Alternatively, the light adjusting structure may include a light transmitting hole 121 inside the light shielding layer 12. As shown in fig. 1, the cross-sectional area of the light-transmitting hole 121 increases in a direction from the center of the light-shielding layer 12 to the edge of the light-shielding layer 12, and the light intensity of the light signal passing through the light-transmitting hole 121 increases accordingly. Therefore, the difference of the optical signals received by the photoelectric sensing units 11 is small, the brightness of the biological characteristic information image formed by the photoelectric sensing units 11 in the photoelectric sensing array is uniform, and the biological characteristic information image with uniform brightness is obtained.
Specifically, the increasing of the sectional area of the light-transmitting hole 121 along the direction from the center of the light-shielding layer 12 to the edge of the light-shielding layer 12 may include: the sectional areas of the light-transmitting holes 121 increase in sequence in the direction from the center of the light-shielding layer 12 to the edge of the light-shielding layer 12, for example, the sectional areas of the light-transmitting holes 121 having the same distance from the center of the light-shielding layer 12 are the same, and the sectional areas of the light-transmitting holes 121 having different distances from the center of the light-shielding layer 12 are different; alternatively, the light-shielding layer 12 is divided into a plurality of concentric annular regions centered on the center of the light-shielding layer 12, the annular regions may include, but are not limited to, circular annular regions, rectangular annular regions, or the like, and the cross-sectional areas of the light-transmitting holes 121 in the same annular region are the same. The cross-sectional area of the light holes 121 in different annular regions increases in sequence along the direction from the center of the light-shielding layer 12 to the edge of the light-shielding layer 12.
In some optional embodiments of the present application, the light hole 121 located at the center of the light shielding layer 12 is a first light hole, the cross-sectional area of the first light hole is a first cross-sectional area, the light hole 121 located at the edge of the light shielding layer 12 is a second light hole, and the cross-sectional area of the second light hole is a second cross-sectional area; the ratio of the first cross-sectional area to the second cross-sectional area is smaller than or equal to a first target threshold value, so that the difference between the light intensity of the first light transmission hole and the light intensity of the second light transmission hole is kept in a reasonable range, and therefore, the brightness of the biological characteristic information image formed by the photoelectric sensing units 11 in the central area and the edge area in the photoelectric sensing array is uniform.
Illustratively, the first target threshold may be 0.8, i.e., the first cross-sectional area is less than or equal to 4/5 of the second cross-sectional area. Specifically, under the condition that the ratio of the first cross-sectional area to the second cross-sectional area is less than or equal to 0.8, the difference between the light intensity of the first light transmission hole and the light intensity of the second light transmission hole can be kept in a reasonable range, and a biological characteristic information image with more uniform brightness can be obtained.
It should be noted that the first target threshold may also be set according to actual situations, for example, the first target threshold may also be 0.4, 0.7, or 0.9, and the first target threshold is not specifically limited in this embodiment of the application.
Specifically, in order to further enhance the light-shielding effect of the light-shielding layer 12, in some optional embodiments of the present application, the light-shielding layer 12 may include multiple sub-light-shielding layers. Along the direction from the top to the bottom of the light shielding layer 12, the centers of the light holes 121 on the sub-light shielding layer are aligned, and the aperture of the light holes 121 on the sub-light shielding layer is decreased progressively to play a role in gathering light, so that the effect of preventing the light crosstalk of the light shielding layer 12 is further improved.
In the embodiment of the present application, in a direction from the center of the light shielding layer 12 to the edge of the light shielding layer 12, the sectional area of the light-transmitting hole 121 on at least one layer of the sub-light shielding layer increases progressively, so that in the direction from the center of the light shielding layer 12 to the edge of the light shielding layer 12, the light intensity of the optical signal passing through the light-transmitting hole 121 correspondingly increases progressively. Therefore, the brightness of the biological characteristic information image finally formed by the photoelectric sensing unit 11 can be increased more uniformly, and the biological characteristic information image with more uniform brightness can be obtained.
For example, the cross-sectional area of the light-transmitting hole 121 on each sub-light-shielding layer increases along the direction from the center of the light-shielding layer 12 to the edge of the light-shielding layer 12; alternatively, only the cross-sectional area of the light-transmitting mirror on the bottom sub-light-shielding layer increases, and the cross-sectional area of the light-transmitting hole 121 on each sub-light-shielding layer in the other sub-light-shielding layers is the same.
In some optional embodiments of the present application, the light adjusting structure may include a microlens layer disposed above the light shielding layer 12, the microlens layer including a plurality of microlenses 13, the microlenses 13 corresponding to the light-transmitting holes 121. In practical applications, the centers of the microlenses 13, the centers of the light-transmitting holes 121, and the centers of the photoelectric sensing units 11 are aligned such that the centers of the microlenses 13, the centers of the light-transmitting holes 121, and the centers of the photoelectric sensing units 11 are on a straight line.
In particular, a microlens 13 may be used to focus the optical signal. When an external optical signal enters the optical sensor, the micro-lens 13 may collect the optical signal and project the collected optical signal into the light-transmitting hole 121 of the light-shielding layer 12, so that the optical signal passes through the light-transmitting hole 121 and is incident on the corresponding photoelectric sensing unit 11.
Referring to fig. 3, a schematic structural diagram of another optical sensor according to an embodiment of the present application is shown, as shown in fig. 3, the height of the microlens 13 increases from the center of the microlens layer to the edge of the microlens layer. In practical applications, the higher the arch height of the microlens 13 is, the stronger the light-gathering capability thereof is, and the more the light intensity incident on the corresponding photoelectric sensing unit 11 after being gathered by the microlens 13 is in a unit time. Therefore, when the height of the microlenses 13 increases in the direction from the center of the microlens layer to the edge of the microlens layer, the intensity of light incident on the photoelectric sensing unit 11 after being condensed by the microlenses 13 also tends to increase in the direction from the center to the edge. Therefore, the brightness of the biological characteristic information image finally formed by the photoelectric sensing units 11 in the photoelectric sensing array is uniform, and the biological characteristic information image with uniform brightness is obtained.
Specifically, in a direction from the center of the microlens layer to the edge of the microlens layer, the increasing arch height of the microlenses 13 may include: the heights of the microlenses 13 are sequentially increased along the direction from the center of the microlens layer to the edge of the microlens layer, for example, the heights of the microlenses 13 having the same distance from the center of the microlens layer are the same, and the heights of the microlenses 13 having different distances from the center of the microlens layer are different; alternatively, the microlens layer is divided into a plurality of concentric annular regions centered on the center of the microlens layer, the annular regions may include, but are not limited to, circular annular regions, rectangular annular regions, or the like, and the heights of the microlenses 13 in the same annular region are the same. The heights of the microlenses 13 of different annular areas sequentially increase along the direction from the center of the microlens layer to the edge of the microlens layer.
In some optional embodiments of the present application, the microlenses 13 located at the center of the microlens layer are first microlenses, the heights of the first microlenses are first heights, the microlenses 13 located at the edges of the microlens layer are second microlenses, and the heights of the second microlenses are second heights; wherein a ratio of the first camber to the second camber is less than or equal to a second target threshold. So that the difference between the light intensity of the first microlens and the light intensity of the second microlens is kept in a reasonable range, and thus, the brightness of the biological characteristic information image formed by the photoelectric sensing units 11 in the central area and the edge area in the photoelectric sensing array is relatively uniform.
Illustratively, the second target threshold is 0.5, i.e., the first arch height is less than or equal to 1/2 of the second arch height. Specifically, under the condition that the ratio of the first vault height to the second vault height is less than or equal to the second target threshold, the difference between the light intensity of the first micro-lens and the light intensity of the second micro-lens can be kept in a reasonable range, which is beneficial to a biological characteristic information image with more uniform brightness.
It should be noted that the second target threshold may also be set according to an actual situation, for example, the second target threshold may also be 0.2, 0.4, or 0.7, and the second target threshold is not specifically limited in the embodiment of the present application.
In still other alternative embodiments of the present application, the microlenses 13 may be disposed only over the edge regions of the light-shielding layer 12, and no microlenses are disposed over the central region of the light-shielding layer 12. After the light is condensed, the micro lens 13 may project the condensed light signal into the light hole 121 in the edge region of the light shielding layer 12 to increase the light intensity of the photoelectric sensing unit 11 in the edge region of the photoelectric sensing array, so that the brightness of the image formed by the photoelectric sensing unit 11 in the photoelectric sensing array is relatively uniform, and a biometric information image with relatively uniform brightness is obtained.
In practical applications, in the case that the microlenses 13 are only disposed above the edge region of the light-shielding layer 12, the heights of the microlenses 13 may be the same, or the heights of the microlenses 13 may increase in a direction from the center of the microlens layer to the edge of the microlens layer, and the heights of the microlenses 13 may not be specifically limited in the present application.
Alternatively, the material of the light shielding layer 12 may be selected from: the specific material of the light-shielding layer 12 in the embodiment of the present application is not limited.
Referring to fig. 4 to 7, which are schematic structural diagrams illustrating another optical sensor according to an embodiment of the present application, as shown in fig. 4 to 7, the light ray adjustment structure may further include a first light-transmitting layer 14 disposed above the photoelectric sensor array, where a light transmittance of the first light-transmitting layer 14 for the light signal increases along a direction from a center of the first light-transmitting layer 14 to an edge of the first light-transmitting layer 14.
The light transmittance of the first light-transmitting layer 14 with respect to the optical signal may be a light transmittance with respect to a full-wavelength band optical signal, or may be a light transmittance with respect to a partial-wavelength band optical signal, for example, the optical signal in the wavelength band is used for biometric information recognition. The embodiment of the present application does not limit this.
Specifically, the first light-transmitting layer 14 may be configured to transmit an optical signal, and the higher the light transmittance of the first light-transmitting layer 14 is, the greater the intensity of light incident on the corresponding photoelectric sensing unit 11 after passing through the first light-transmitting layer 14 is. Therefore, when the light transmittance of the first light-transmitting layer 14 increases in the direction from the center of the first light-transmitting layer 14 to the edge of the first light-transmitting layer 14, the light intensity incident on the photoelectric sensing unit 11 after passing through the first light-transmitting layer 14 also tends to increase in the direction from the center to the edge. Therefore, the brightness of the biological characteristic information image formed by the photoelectric sensing units 11 in the photoelectric sensing array is uniform, and a biological characteristic information image with uniform brightness is obtained.
Specifically, increasing the light transmittance of the first light-transmitting layer 14 in a direction from the center of the first light-transmitting layer 14 to the edge of the first light-transmitting layer 14 may include: the light transmittance of the first light-transmitting layer 14 increases sequentially in the direction from the center of the first light-transmitting layer 14 to the edge of the first light-transmitting layer 14; alternatively, the first light-transmitting layer 14 is divided into concentric annular regions with the center of the first light-transmitting layer 14 as the center, the light transmittances of the first light-transmitting layer 14 in the annular regions are the same, and the light transmittances of the annular regions sequentially increase in the direction from the center of the first light-transmitting layer 14 to the edge of the first light-transmitting layer 14.
Alternatively, the first light-transmitting layer 14 may be made of a black matrix material such as neoprene or carbon black, and the light transmittance of the first light-transmitting layer 14 is related to the thickness thereof, and the smaller the thickness of the first light-transmitting layer 14, the higher the light transmittance thereof. In some alternative embodiments of the present application, the thickness of the first light-transmitting layer 14 decreases and the light transmittance increases in a direction from the center of the first light-transmitting layer 14 to the edge of the first light-transmitting layer 14. Therefore, the light intensity incident on the photoelectric sensing unit 11 after passing through the first light-transmitting layer 14 is correspondingly increased from the center to the edge, which is beneficial to obtaining a biological characteristic information image with uniform brightness.
In other alternative embodiments of the present application, the first light-transmitting layer 14 may also be made of a doped material, so that the light transmittance thereof is changed by the doped material. The doping material of the central region and the doping material of the edge region of the first light-transmitting layer 14 are different, so that the light transmittances of the central region and the edge region of the first light-transmitting layer 14 are different.
For example, a doping material capable of reducing light transmittance may be used in the central region of the first light-transmitting layer 14, and a doping material capable of enhancing light transmittance may be used in the edge region of the first light-transmitting layer 14; alternatively, a doping material capable of reducing light transmittance is used only in the central region of the first light-transmitting layer 14; alternatively, a doping material capable of enhancing light transmittance is used only in the edge region of the first light-transmitting layer 14. In the embodiment of the present application, a doping material of the first light-transmitting layer 14 is not particularly limited.
It should be noted that, in the drawings in the embodiments of the present application, the microlens 13 and/or the light-transmitting hole 121 are in an aligned relationship with the photoelectric sensing unit 11, but the drawings are only schematic and do not have a strict alignment, and it is understood that the microlens 13 and/or the light-transmitting hole 121 may be in a one-to-one, one-to-many or many-to-one relationship with the photoelectric sensing unit 11, which is not limited in the embodiments of the present application.
In summary, the optical sensor according to the embodiments of the present application may include at least the following advantages:
in the embodiment of the application, can light regulation structure is set up on one side of the photosurface of photoelectric sensing unit, light regulation structure can be used for adjusting the light intensity of the light signal of photoelectric sensing unit, so that at least two the photoelectric sensing unit receives the light intensity of the light signal is different. Therefore, the light intensity of the optical signal received by the photoelectric sensing unit can be adjusted according to the actual situation so as to obtain an image with uniform brightness, and the accuracy of biological identification is improved.
The embodiment of the application also provides a biological characteristic information identification module, for example, the biological characteristic information identification module can be a fingerprint identification module. The biometric information recognition module specifically may include: the optical sensor in the above embodiments; wherein the light guiding structure is disposed above the optical sensor.
In the embodiment of the present application, the structure of the optical sensor is the same as that of the optical sensors in the above embodiments, and the beneficial effects thereof are also similar, which are not described herein again.
In particular, the light guide structure may be configured to perform propagation guide on a light signal from a direction of a finger, and guide the light signal in a preset angle range onto the optical sensor. Optionally, the light guiding structure may include: at least one of a microlens light directing structure, a lens group, an aperture light directing structure, a collimating layer. Wherein the microlens light guiding structure may include a microlens and a diaphragm layer.
In some optional embodiments of the present application, the biometric information recognition module further comprises a second light-transmissive layer, the second light-transmissive layer is located between the light-guiding structure and the optical sensor, or the second light-transmissive layer is located above the light-guiding structure; and the light transmittance of the second light-transmitting layer is increased in sequence along the direction from the center of the second light-transmitting layer to the edge of the second light-transmitting layer.
Specifically, the second light-transmitting layer may be configured to transmit an optical signal, and the higher the light transmittance of the second light-transmitting layer is, the greater the intensity of light incident on the corresponding optical sensor after passing through the second light-transmitting layer is. Therefore, when the light transmittance of the second light-transmitting layer increases in the direction from the center of the second light-transmitting layer to the edge of the second light-transmitting layer, the light intensity incident on the photoelectric sensing unit on the optical sensor after the second light-transmitting layer is transmitted tends to increase correspondingly in the direction from the center to the edge. Therefore, the brightness of the biological characteristic information image formed by the photoelectric sensing units in the whole photoelectric sensing array is uniform, and the biological characteristic information image with uniform brightness is obtained.
Specifically, increasing the light transmittance of the second light-transmitting layer in a direction from the center of the second light-transmitting layer to the edge of the second light-transmitting layer may include: the light transmittance of the second light-transmitting layer increases sequentially along the direction from the center of the second light-transmitting layer to the edge of the second light-transmitting layer; alternatively, the second light-transmitting layer is divided into concentric annular regions with the center of the second light-transmitting layer as the center, the light transmittances of the second light-transmitting layer in the annular regions are the same, and the light transmittances of the annular regions sequentially increase in the direction from the center of the second light-transmitting layer to the edge of the second light-transmitting layer.
In other alternative embodiments of the present application, the second light-transmitting layer may be made of a black matrix material such as neoprene or carbon black, and the light transmittance of the second light-transmitting layer is related to the thickness of the second light-transmitting layer. In this embodiment, the thickness of the second light-transmitting layer decreases and the light transmittance thereof increases in a direction from the center of the second light-transmitting layer to the edge of the second light-transmitting layer. Therefore, the light intensity incident on the photoelectric sensing unit after the second light-transmitting layer transmits light is correspondingly increased from the center to the edge, and the biological characteristic information image with uniform brightness is obtained.
Optionally, the second light-transmitting layer may also be made of a doped material, so that the light transmittance thereof is changed by the doped material. The doping material of the central region of the second light-transmitting layer is different from that of the edge region, so that the light transmittance of the central region of the second light-transmitting layer is different from that of the edge region.
For example, a doping material capable of reducing light transmittance may be used in the central region of the second light-transmitting layer, and a doping material capable of enhancing light transmittance may be used in the edge region of the second light-transmitting layer; alternatively, a doping material capable of reducing light transmittance is used only in the central region of the second light-transmitting layer; alternatively, a dopant capable of reducing light transmittance is used only in the edge region of the second light-transmitting layer. In the embodiment of the application, a doping material of the second light-transmitting layer is not specifically limited.
In summary, the biometric information recognition module described in the embodiments of the present application can include at least the following advantages:
in the embodiment of the application, can the photosurface one side of the photoelectric sensing unit of biological characteristic information identification module sets up light and adjusts the structure, light is transferred the structure and can be used for adjusting the incidence extremely the light intensity of the light signal of photoelectric sensing unit makes at least two the photoelectric sensing unit receives the light intensity of light signal is different. Therefore, the light intensity of the optical signal received by the photoelectric sensing unit can be adjusted according to the actual situation so as to obtain a biological characteristic information image with uniform brightness, and the accuracy of biological characteristic information identification is improved.
The embodiment of the application also provides electronic equipment which can comprise a display panel and the biological characteristic information identification module in any embodiment; the biological characteristic information identification module is arranged below the display panel.
The electronic device according to the embodiment of the application can be a smart phone, a computer, a multimedia player, an electronic reader, a wearable device and the like.
In this application embodiment, electronic equipment can the photosurface one side of the photoelectric sensing unit of biological characteristic information identification module sets up light and adjusts the structure, light is transferred the structure and can be used for adjusting the incidence extremely the light intensity of photoelectric sensing unit's light signal makes at least two photoelectric sensing unit receives the light intensity of light signal is different. Therefore, the light intensity of the optical signal received by the photoelectric sensing unit can be adjusted according to the actual situation so as to obtain a biological characteristic information image with uniform brightness, and the accuracy of biological characteristic information identification is improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (18)
1. An optical sensor, characterized in that the optical sensor comprises:
a substrate;
the photoelectric sensing array is arranged on the substrate and comprises a plurality of photoelectric sensing units; and
the light adjusting structure is arranged on one side of the photosensitive surfaces of the photoelectric sensing units and used for adjusting the light intensity of the light signals incident to the photoelectric sensing units so that at least two photoelectric sensing units receive the light signals with different light intensities.
2. The optical sensor of claim 1, wherein the photo-sensing units in the central region of the photo-sensing array receive light signals having a lower intensity than the photo-sensing units in the edge regions of the photo-sensing array.
3. The optical sensor of claim 2, wherein the light intensity of the optical signal received by the photo-sensing unit increases in a direction from the center of the photo-sensing array to the edge of the photo-sensing array.
4. The optical sensor as claimed in claim 1, wherein a light shielding layer is further disposed on a side of the light sensing surface of the photo-sensing unit, the light shielding layer having a plurality of light holes corresponding to the photo-sensing unit;
the light adjusting structure is arranged inside the light shielding layer, or the light adjusting structure is arranged above or below the light shielding layer.
5. The optical sensor of claim 4, wherein the light-regulating structure comprises the light-transmissive hole inside the light-shielding layer;
the cross-sectional area of the light-transmitting hole increases along the direction from the center of the light-shielding layer to the edge of the light-shielding layer.
6. The optical sensor as claimed in claim 5, wherein the light hole at the center of the light shielding layer is a first light hole, the cross-sectional area of the first light hole is a first cross-sectional area, the light hole at the edge of the light shielding layer is a second light hole, and the cross-sectional area of the second light hole is a second cross-sectional area;
a ratio of the first cross-sectional area to the second cross-sectional area is less than or equal to a first target threshold.
7. The optical sensor of claim 6, wherein the first target threshold is 0.8.
8. The optical sensor of claim 5, wherein the light-shielding layer comprises a plurality of sub-light-shielding layers;
the cross section area of the light holes in at least one sub-shading layer increases along the direction from the center of the shading layer to the edge of the shading layer;
along the direction from the top to the bottom of the light shielding layer, the centers of the light holes on the sub light shielding layer are aligned, and the aperture of the light holes on the sub light shielding layer is decreased progressively.
9. The optical sensor of claim 4, wherein the light conditioning structure comprises a microlens layer disposed over the light blocking layer, the microlens layer comprising a plurality of microlenses, the microlenses corresponding to the light transmissive apertures.
10. The optical sensor of claim 9, wherein the lenticules have increasing vault height in a direction from a center of the lenticule layer to an edge of the lenticule layer.
11. The optical sensor of claim 10, wherein the microlens at the center of the microlens layer is a first microlens, the first microlens has a first vault height, the microlens at the edge of the microlens layer is a second microlens, and the second microlens has a second vault height; wherein,
a ratio of the first camber to the second camber is less than or equal to a second target threshold.
12. The optical sensor of claim 11, wherein the second target threshold is 0.5.
13. The optical sensor of claim 9, wherein the microlenses are disposed only over an edge region of the light-shielding layer.
14. The optical sensor of any one of claims 1 to 13, wherein the light-modifying structure comprises a first light-transmissive layer disposed over the photosensor array;
the light transmittance of the first light-transmitting layer increases in a direction from the center of the first light-transmitting layer to the edge of the first light-transmitting layer.
15. The optical sensor of claim 14, wherein the thickness of the first light-transmissive layer decreases in a direction from the center of the first light-transmissive layer to the edge of the first light-transmissive layer.
16. The biometric information recognition module is characterized by comprising: a light directing structure and an optical sensor according to any one of claims 1 to 15; wherein,
the light guide structure is disposed above the optical sensor.
17. The biometric information recognition module of claim 16, further comprising a second light transmissive layer between the light directing structure and the optical sensor or above the light directing structure; wherein,
the light transmittance of the second light-transmitting layer increases in a direction from the center of the second light-transmitting layer to the edge of the second light-transmitting layer.
18. An electronic device, characterized in that the electronic device comprises: a display panel and the biometric information recognition module of any one of claims 16 to 17; wherein,
the biological characteristic information identification module is arranged below the display panel.
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