TW201911116A - Biometric device - Google Patents

Abstract

A biometric device includes an illuminating unit and an imaging module. The imaging module includes an optical angular selective structure and a sensing layer. The light selecting structure includes a micro lens array, a refractive layer and a light shielding layer. The refractive layer is disposed between the micro lens array and the light shielding layer. The micro lens array includes a plurality of micro lens units, and the light shielding layer has a plurality of light passing portions. The sensing layer defines multiple sensing regions which are spaced apart from each other. The light shielding layer is disposed between the refractive layer and the sensing layer. The sensing regions correspond to the light passing portions, respectively. An optical angular selective distance is defined between the light shielding layer and the sensing layer.

Description

Biometric device

The present invention relates to a biometric device, and more particularly to a thinned biometric device.

Biometric technology refers to the use of human physiological characteristics or behavioral characteristics to achieve identity identification and authentication and authorization. The physiological characteristics of the human body include fingerprints, palm prints, vein distribution, iris, retina and facial features. Today, biometrics are used in areas such as digital assistants, smart phones, laptops, financial cards, e-wallets, and customs clearance that are highly demanding for information privacy and personal safety.

In general, biometric technologies that are widely used include fingerprint recognition and vein identification. In the existing fingerprint recognition device and vein identification device, in order to focus the light reflected by the finger or vein onto the photoreceptor, the internal optical system must satisfy the imaging formula (1/f=1/u+1/v. where f is the focal length, u For the object distance, v is the image distance, the lens with sufficient focal length is disposed, which causes the overall size of the device to be excessively large, and is not suitable for use in a miniaturized or portable electronic device. If the lens is omitted, the light received by the photoreceptor will be insufficient, and the light reflected by a single feature point of the finger or vein will diverge in all directions and may be received by a plurality of photoreceptors, so that the output image signal resolution is not good. , affecting the identification accuracy of the device. At present, a light-shielding layer is formed by using a light-shielding layer to form a high aspect ratio (greater than 10) to avoid light divergence, and a point-to-point imaging effect is achieved. However, the light-passing aperture of the light-shielding layer is small, so that the light-input amount of the photosensitive unit is low, or the aperture diameter is large. It must have a sufficient thickness to satisfy the high aspect ratio of the light-passing portion, resulting in problems such as an increase in thickness of the device and difficulty in manufacturing the process.

In view of the above problems, the present invention discloses a biometric device that helps solve the problem of excessive volume of the existing biometric device.

The biometric device disclosed in the present invention comprises an illumination unit and an imaging module. The illumination unit is configured to emit light to the living body, and the imaging module is configured to receive the light of the illumination unit. The imaging module includes a light screening structure and a photosensitive layer. The light screening structure comprises a microlens array, a refractive focusing layer and a light shielding layer. The refractive focusing layer is interposed between the microlens array and the light shielding layer. The microlens array includes a plurality of microlens units, and the light shielding layer has a plurality of light passing portions. The photosensitive layer is used to receive light reflected from the living body. The photosensitive layer has a plurality of photosensitive regions spaced apart. The light shielding layer is interposed between the refractive focusing layer and the photosensitive layer. The photosensitive regions respectively correspond to the light-passing portions, and the light-shielding layer and the photosensitive layer have an angular screening interval. The radius of curvature of the microlens unit is R, the diameter of the microlens unit is D, the maximum thickness of the microlens unit is LH, the center spacing of two adjacent microlens units is P, and the thickness of the refractive focusing layer is H, clear light The aperture of the portion is WO, the aspect ratio of the light-passing portion is AR, the angle of the screening interval is S, and the width of the photosensitive region is WS, which satisfies the following conditions:

AR < 1.0;

0.5 ≦ R/D ≦ 2.86;

0.02 < WO/P < 0.3;

(H+LH) × (WS-WO) / (2 × P + WO) ≦ S ≦ (H + LH) × (2 × P - WS - WO) / (2 × P + WO).

The biometric device disclosed in the present invention comprises a lighting unit and an imaging module. The illumination unit is configured to emit light to the living body, and the imaging module is configured to receive the light of the illumination unit. The imaging module includes a light screening structure and a photosensitive layer. The light screening structure comprises a microlens array, a refractive focusing layer and a light shielding layer. The refractive focusing layer is interposed between the microlens array and the light shielding layer. The microlens array includes a plurality of microlens units, and the light shielding layer has a plurality of light passing portions. The photosensitive layer is used to receive light reflected from the living body. The light shielding layer is interposed between the refractive focusing layer and the photosensitive layer, and the angle between the light shielding layer and the photosensitive layer is an angle of screening. The radius of curvature of the microlens unit is R, the diameter of the microlens unit is D, the center spacing of two adjacent microlens units is P, the aperture of the light passing portion is WO, and the aspect ratio of the light passing portion is AR, angle The screening pitch is S, which satisfies the following conditions:

1.0 ≦ AR < 5.0;

0.6 < R/D ≦ 2.86;

0.02 ≦ WO/P ≦ 0.5; and

0 ≦ S < 3P.

According to the biometric device disclosed in the present invention, the aspect ratio of the light-passing portion of the light-shielding layer is limited to a certain range to control the thickness of the light-shielding layer, which contributes to the thinning of the biometric device. In addition, when the light screening structure of the biometric device and the specification of the photosensitive layer satisfy a specific condition, if the reflected light generated by the feature point of the living body enters the microlens unit corresponding to one of the photosensitive cells at a large incident angle, this The reflected light is blocked by the light shielding layer of the light screening structure or can only be projected to the non-photosensitive area of the photosensitive layer, and is not received by other photosensitive cells adjacent to one of the aforementioned photosensitive cells, thereby helping to reduce crosstalk and enhance identification. The accuracy of the feature points of the organism. Therefore, the biometric device of the present invention can not follow the conventional lens imaging formula, and does not need to use a structure having an aspect ratio greater than 10 to screen the incident light angle, thereby improving the light entering efficiency and further satisfying the demand for thinning.

The above description of the disclosure and the following description of the embodiments of the present invention are intended to illustrate and explain the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

Please refer to FIG. 1 and FIG. 2 at the same time. 1 is a perspective view of a biometric device according to an embodiment of the invention. 2 is a side cross-sectional view of a biometric device in accordance with an embodiment of the present invention. In this embodiment, the biometric device 1 includes a base 10, an imaging module 20, and a lighting unit 30. The biometric device 1 is used to identify biometric features of a part of an organism, such as a fingerprint, a vein or an iris. The illumination unit 30 and the imaging module 20 are both disposed on the base 10 , and the imaging module 20 is located on one side of the illumination unit 30 . The illumination unit 30 is, for example but not limited to, a light-emitting diode that emits light to a feature point of the living body, and the feature point reflects light into the imaging module 20. This embodiment is described by a reflective biometric device, but the invention is not limited thereto. In other embodiments, depending on the location of the illumination unit, the biometric device may be transmissive (lighted from above the living body) or scattered (lighted laterally from the living body).

Referring to FIG. 2, the imaging module 20 includes a light screening structure 210 and a photosensitive layer 220. The light screening structure 210 is configured to screen an incident light angle, and includes a microlens array 211, a refractive focusing layer 212, a light shielding layer 213, and a spacer layer 214.

The microlens array 211 includes a plurality of microlens units 2111. In the present embodiment, the microlens units 2111 are identical to each other and closely arranged, that is, the ratio of the diameter D of the microlens unit 2111 to the center pitch P of the adjacent two microlens units 2111 is 1 (D/P = 1). . The arrangement density of the microlens unit 2111 is not intended to limit the invention. In other embodiments, the microlens units may be arranged loosely (D/P<1), or adjacent microlens units may be connected to each other such that each microlens unit has a rectangular shape in a plan view. /P>1). When D/P=1.414, the aperture ratio (effective light transmittance ratio) of the microlens array 211 is 100%.

The refractive focusing layer 212 is, for example but not limited to, a light transmissive resin layer, and the microlens array 211 is disposed on one side of the refractive focusing layer 212. The light shielding layer 213 is, for example but not limited to, a black matrix that is opaque or low in light transmittance, and the refractive focusing layer 212 is interposed between the microlens array 211 and the light shielding layer 213. The light shielding layer 213 has a plurality of light passing portions 2131, and these light passing portions 2131 correspond to the micro lens units 2111, respectively. The light passing portion 2131 is, for example but not limited to, a perforation of the light shielding layer 213. The spacer layer 214 is, for example but not limited to, a resin dielectric layer located on one side of the light shielding layer 213 with respect to the refractive focusing layer 212.

The photosensitive layer 220 includes a plurality of photosensitive cells 221, 222, and 223 disposed at intervals, such as, but not limited to, a complementary metal oxide semiconductor (CMOS) photosensitive element. The spacer layer 214 is interposed between the light shielding layer 213 and the photosensitive cells 221 to 223 of the photosensitive layer 220 to define an angle of the screening interval S between the light shielding layer 213 and the photosensitive layer 220. The photosensitive cells 221 to 223 each have a photosensitive region at the top, which is capable of receiving light reflected from the living body. The photosensitive regions of the photosensitive cells 221 to 223 correspond to the light-passing portions 2131 of the light shielding layer 213, respectively, and a non-photosensitive region 224 is formed between the adjacent two photosensitive cells 221 to 223.

When the light of the illumination unit 30 is projected to one of the feature points of the living body, the feature point reflects the light and the reflected light advances toward the imaging module 20. The reflected light is sequentially projected to the photosensitive layer 220 through the microlens array 211, the refractive focusing layer 212, the light passing portion 2131 of the light shielding layer 213, and the spacer layer 214. The photosensitive regions of the photosensitive cells 221 to 223 receive the reflected light and convert them into image signal outputs. When the reflected light generated by the feature points of the living body is projected into the imaging module 20, if the reflected light passing through one of the light passing portions 2131 is received by the plurality of photosensitive cells (for example, received by the photosensitive cells 222 and 223 at the same time), the output is output. The image signal may make it difficult for the biometric device 1 to accurately recognize the aforementioned feature points due to cross talk. In order to prevent the above problem from occurring and to reduce the thickness of the biometric device 1, the biometric device 1 of the present embodiment improves the spatial arrangement relationship between the elements.

As shown in FIG. 2, each light-passing portion 2131 has an aspect ratio AR (ie, a ratio of the thickness BH of the light-shielding layer 213 to the aperture WO of the light-passing portion 2131, AR=BH/WO), which satisfies the following condition: AR < 1.0. Thereby, it is possible to prevent the light-shielding layer 213 from being excessively large in the aspect ratio, which is difficult to manufacture, and contributes to the reduction in thickness of the biometric device 1.

Each microlens unit 2111 has a radius of curvature R, each microlens unit 2111 has a diameter D, two adjacent microlens units 2111 have a center pitch P, and each light passing portion 2131 has an aperture WO, a light shielding layer 213 and a photosensitive The layer 220 has an angular screening pitch S, each microlens unit 2111 has a maximum thickness LH, and the refractive focusing layer 212 has a thickness H. The photosensitive regions of the photosensitive cells 221 to 223 each have a width WS which satisfies the following conditions:

[Condition 1] 0.5 ≦ R/D ≦ 2.86;

[Condition 2] 0.02 < WO/P < 0.3;

[Condition 3] (H+LH) × (WS-WO) / (2 × P + WO) ≦ S ≦ (H + LH) × (2 × P - WS - WO) / (2 × P + WO).

When the condition one is satisfied, the light entering the microlens unit 2111 at a large incident angle can be prevented from being received by the adjacent photosensitive unit, contributing to the reduction of crosstalk. For example, when the reflected light signal from the feature point of the living body enters the microlens unit 2111 corresponding to the photosensitive unit 221 at a large incident angle, it is ensured that the reflected light is not received by the photosensitive unit 222 or 223. Further, as shown in FIG. 2, since the processing limit of the microlens unit 2111 on the process is hemispherical, the minimum value of R/D cannot be less than 0.5.

When Condition 2 is satisfied, light entering the microlens unit 2111 at an excessive incident angle is blocked by the light shielding layer 213 without being received by the photosensitive unit, contributing to further reduction of crosstalk. For example, when the reflected light enters the microlens unit 2111 corresponding to the photosensitive unit 221 at a large incident angle, the reflected light is blocked by the light shielding layer 213 without being received by the photosensitive unit 222 or 223. Further, since the aperture WO of the light-passing portion 2131 is too small, an unnecessary optical diffraction phenomenon is generated, and the transmittance is largely lowered due to the sub-wavelength via hole, so the minimum value of WO/P cannot be less than 0.02.

When the condition three is satisfied, even if light entering the microlens unit 2111 at an excessive incident angle passes through the adjacent light passing portion 2131, the light is projected to the non-photosensitive region 224 of the photosensitive layer 220 without being received by the photosensitive unit. For example, when the reflected light enters the microlens unit 2111 corresponding to the photosensitive unit 221 at a larger incident angle and passes through the light passing portion 2131 corresponding to the photosensitive unit 222, the reflected light is projected between the photosensitive units 222 and 223. The non-photosensitive area 224 further ensures the reduction of crosstalk.

The total thickness of the microlens array 211, the refractive focusing layer 212, the light shielding layer 213, the spacer layer 214, and the photosensitive layer 220 of the present embodiment may be less than 3.0 mm (mm) through the spatial configuration of the above components, thereby contributing to the realization of the biological The identification device 1 is thinned, and at the same time, good recognition accuracy is maintained for the biological feature points.

In FIG. 2, a single microlens unit corresponds to a single photosensitive unit, but the invention is not limited thereto. Please refer to FIG. 3, which is a side cross-sectional view of a biometric device according to another embodiment of the present invention. Since this embodiment is similar to the embodiment of Fig. 2, the following description will be made on the difference.

In the embodiment of FIG. 3, the light screening structure 210b of the imaging module 20b of the biometric device includes a microlens array 211b, a refractive focusing layer 212, a light shielding layer 213, a spacer layer 214, and a mask pattern 215. The microlens array 211b includes a first lens unit group 2112 and a second lens unit group 2113, and the first lens unit group 2112 and the second lens unit group 2113 each include a plurality of microlens units. The mask pattern 215 is disposed in the spacer layer 214, and the photosensitive cells 221 to 223 of the photosensitive layer 220 respectively define a plurality of photosensitive regions and a plurality of non-photosensitive regions, wherein the photosensitive regions expose the tops of the photosensitive cells 221 to 223, and The non-photosensitive area is covered by the mask pattern 215.

The first lens unit group 2112 corresponds to the photosensitive unit 221 of the photosensitive layer 220, and the second lens unit group 2113 corresponds to the photosensitive unit 222 of the photosensitive layer 220, and a configuration in which a plurality of microlens units correspond to a single photosensitive unit is realized. In detail, the plurality of microlens units of the first lens unit group 2112 respectively correspond to the plurality of photosensitive regions of the photosensitive unit 221, and the plurality of microlens units of the second lens unit group 2113 correspond to the plurality of photosensitive units 222, respectively. Photosensitive area.

4 is a side cross-sectional view of a biometric device in accordance with yet another embodiment of the present invention. Since this embodiment is similar to the embodiment of Fig. 2, the following description will be made on the difference. In the embodiment of FIG. 4, the optical screening structure 210c of the imaging module 20c of the biometric device includes a microlens array 211, a refractive focusing layer 212, a light shielding layer 213c, and a spacer layer 214. Each light-passing portion 2131c of the light-shielding layer 213c has an aspect ratio AR which satisfies the following condition: 1.0 ≦ AR < 5.0. Thereby, the side wall of the light-passing portion 2131c can be used to block light from being projected onto the plurality of photosensitive cells, which contributes to reducing crosstalk and achieving the demand for thinning of the biometric device. Compared with the embodiment of FIG. 2, since the depth-to-width ratio of the light-passing portion 2131c is changed by the numerical range of the AR, the biometric device of the embodiment of FIG. 4 additionally improves the spatial arrangement relationship between the elements.

Each microlens unit 2111 of the microlens array 211 has a radius of curvature R, each microlens unit 2111 has a diameter D, two adjacent microlens units 2111 have a center pitch P, and each light passing portion 2131c has an aperture WO, each The light-passing portions 2131c have an aspect ratio AR, and the light-shielding layer 213c and the photosensitive layer 220 have an angular screening pitch S which satisfies the following conditions:

[Condition 4] 0.6 < R/D ≦ 2.86;

[Condition 5] 0.02 ≦ WO/P ≦ 0.5;

[Condition 6] 0 ≦ S < 3P

When the condition four to the condition six is satisfied, the light entering the microlens unit 2111 at a large incident angle can be prevented from being received by the adjacent photosensitive unit, which helps to reduce crosstalk to improve image quality.

FIG. 5 is a side cross-sectional view of a biometric device according to still another embodiment of the present invention. Since this embodiment is similar to the embodiment of Fig. 4, the following description will be made on the difference.

In the embodiment of FIG. 5, the light screening structure 210d of the imaging module 20d of the biometric device includes a microlens array 211d, a refractive focusing layer 212, and a light shielding layer 213c. The microlens array 211d includes a first lens unit group 2114 and a second lens unit group 2115, and the first lens unit group 2114 and the second lens unit group 2115 each include a plurality of microlens units 2111. The light shielding layer 213c is disposed on the photosensitive layer 220, and the photosensitive cells 221 to 223 of the photosensitive layer 220 respectively define a plurality of photosensitive regions and a plurality of non-photosensitive regions, wherein the photosensitive regions expose the tops of the photosensitive cells 221 to 223, and are not photosensitive. The area is covered by the light shielding layer 213c. The first lens unit group 2114 corresponds to the photosensitive unit 221 of the photosensitive layer 220, and the second lens unit group 2115 corresponds to the photosensitive unit 222 of the photosensitive layer 220, and a configuration in which a plurality of microlens units correspond to a single photosensitive unit is realized.

In the following, several embodiments of the invention having specific specifications are provided to illustrate the biometric device disclosed in the present invention and to verify the efficacy of the biometric device disclosed in the present invention.

[Example 1 to Example 16]

6 is a perspective view of an imaging module of a biometric device according to Embodiments 16 to 16 of the present invention. As an example, the center-to-center spacing P of the adjacent two microlens units 2111 is 50.0 μm (micrometers), the radius of curvature R of the microlens unit 2111 is 25.0 μm, and the diameter D of the microlens unit 2111 is 50.0 μm. The maximum thickness LH of the lens unit 2111 is 25.0 μm. The refractive index of the refractive focusing layer 212 is 1.57, and the thickness H of the refractive focusing layer 212 is 48.00 μm. The aperture WO of the light-passing portion 2131 is 3.0 μm, the thickness BH of the light-shielding layer 213 is 1.5 μm, and the aspect ratio AR of the light-passing portion 2131 is 0.5. The angle S between the light shielding layer 213 and the photosensitive cells 221 to 223 of the photosensitive layer 220 is 16.0 μm. The width WS of each of the photosensitive regions of the photosensitive cells 221 to 223 is 10.0 μm. For the specific specifications of the first embodiment to the sixteenth embodiment, please refer to the following list 1, and all the embodiments satisfy the foregoing condition one, condition two and condition three.

In addition, Comparative Example 1 to Comparative Example 10 are also provided as controls. For specific specifications, please refer to Table 2 below. All of the comparative examples did not satisfy at least one of Condition 1, Condition 2 and Condition 3 described above.

FIG. 7 is a schematic diagram showing the relationship between the received light intensity and the incident angle of light of the photosensitive unit of the biometric device according to the embodiment of the present invention. FIG. 8 is a biometric image according to an embodiment of the present invention. When the reflected light signal generated by the biological feature enters the imaging module of the biometric device, the reflected light signal with a smaller incident angle is received by the photosensitive unit, and the reflected light signal with a larger incident angle cannot be received by the photosensitive unit. Therefore, in the element characteristics of Fig. 7, only the reflected light signal of a small incident angle shows a peak of light intensity. The imaging module of the first embodiment receives the reflected light signal and outputs the high-resolution image of FIG. 8 , which clearly displays the characteristics of the birth object (eg, fingerprint or vein distribution). The imaging modules of the second embodiment to the sixteenth embodiment can also output high resolution images.

Fig. 9 is a view showing the relationship between the received light intensity and the incident angle of light of the photosensitive unit of the biometric device according to Comparative Example 1 of the present invention. Figure 10 is a biometric image of Comparative Example 6 in accordance with the present invention. Compared with the first embodiment, the sixth embodiment does not satisfy the condition two and the third condition, so that the reflected light with a larger incident angle is received by the photosensitive unit, so that the reflected light signal of the small incident angle (the incident angle is less than 3 degrees) in FIG. 9 is A reflected light signal at a large angle of incidence (about 22 degrees) will show a peak in light intensity, which in turn produces crosstalk. The imaging module of Comparative Example 6 receives the reflected light and outputs the image of FIG. 10, the resolution of which is significantly lower than that of the image of FIG. 8, so that the biometric device cannot interpret the features of the living body. The imaging modules of Comparative Examples 1 to 5 and Comparative Examples 7 to 10 also output low resolution images.

[Example 17 to Example 36]

11 is a perspective view of an imaging module of a biometric device according to Embodiment 17 to Embodiment 36 of the present invention. As illustrated in the seventeenth embodiment, the center-to-center spacing P of the adjacent two microlens units 2111 is 50.0 μm (micrometers), the radius of curvature R of the microlens unit 2111 is 40.0 μm, and the diameter D of the microlens unit 2111 is 40.0 μm. The maximum thickness LH of the microlens unit 2111 is 5.36 μm. The refractive index of the refractive focusing layer 212 is 1.57, and the thickness H of the refractive focusing layer 212 is 110.00 μm. The aperture WO of the light-passing portion 2131c is 3.0 μm, the thickness BH of the light-shielding layer 213c is 15.0 μm, and the aspect ratio AR of the light-passing portion 2131c is 5.0. The angle S between the light shielding layer 213c and the photosensitive cells 221 to 223 of the photosensitive layer 220 is 0 μm (that is, the light shielding layer 213c is in close contact with the photosensitive cells 221 to 223). For the specific specifications of the seventeenth embodiment to the thirty-sixth embodiment, please refer to the following Table 3, and all the embodiments satisfy the foregoing condition four, condition five and condition six.

In addition, Comparative Example 11 to Comparative Example 18 are also provided as controls. For specific specifications, please refer to Table 4 below. All of the comparative examples did not satisfy at least one of the foregoing condition four, condition five and condition six.

As described above, in the biometric device disclosed in the present invention, the aspect ratio of the light-transmitting portion of the light-shielding layer is limited to a certain range to control the thickness of the light-shielding layer, which contributes to the reduction in thickness of the biometric device. In addition, when the light screening structure of the biometric device and the specification of the photosensitive layer satisfy a specific condition, if the reflected light generated by the feature point of the living body enters the microlens unit corresponding to one of the photosensitive cells at a large incident angle, this The reflected light is blocked by the light shielding layer of the light screening structure or can only be projected to the non-photosensitive area of the photosensitive layer, and is not received by other photosensitive cells adjacent to one of the aforementioned photosensitive cells, thereby helping to reduce crosstalk and enhance identification. The accuracy of the feature points of the organism. Therefore, the biometric device of the present invention can not follow the conventional lens imaging formula, and does not need to use a structure having an aspect ratio greater than 10 to screen the incident light angle, thereby improving the light entering efficiency and further satisfying the demand for thinning.

Although the present invention has been disclosed above in the foregoing embodiments, these embodiments are not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

1‧‧‧Biometric device

10‧‧‧ Pedestal

20, 20b, 20c, 20d‧‧‧ imaging modules

210, 210b, 210c, 210d‧‧‧ light screening structure

211, 211b, 211d‧‧‧ microlens array

2111‧‧‧Microlens unit

2112, 2114‧‧‧ first lens unit group

2113, 2115‧‧‧ second lens unit group

212‧‧‧Reflective focusing layer

213, 213c‧‧‧ shading layer

2131, 2131c‧‧‧Lighting Department

214‧‧‧ spacer

215‧‧‧ mask pattern

220‧‧‧Photosensitive layer

221, 222, 223‧‧ ‧Photosensitive unit

224‧‧‧ non-photosensitive area

30‧‧‧Lighting unit

BH‧‧‧ thickness of the light-shielding layer

D‧‧‧diameter of microlens unit

H‧‧‧Reflecting the thickness of the focusing layer

Maximum thickness of the LH‧‧ microlens unit

P‧‧‧Center spacing of adjacent two microlens units

R‧‧‧ radius of curvature of the microlens unit

S‧‧‧ Angle screening spacing

WO‧‧‧ aperture of the light department

Width of the photosensitive area of the WS‧‧·photosensitive unit

1 is a perspective view of a biometric device according to an embodiment of the invention. 2 is a side cross-sectional view of the imaging module of the biometric device of FIG. 1. 3 is a side cross-sectional view of an imaging module of a biometric device in accordance with another embodiment of the present invention. 4 is a side cross-sectional view showing an imaging module of a biometric device according to still another embodiment of the present invention. FIG. 5 is a side cross-sectional view showing an imaging module of a biometric device according to still another embodiment of the present invention. 6 is a perspective view of an imaging module of a biometric device according to Embodiments 16 to 16 of the present invention. FIG. 7 is a schematic diagram showing the relationship between the received light intensity and the incident angle of light of the photosensitive unit of the biometric device according to the embodiment of the present invention. FIG. 8 is a biometric image according to an embodiment of the present invention. Fig. 9 is a view showing the relationship between the received light intensity and the incident angle of light of the photosensitive unit of the biometric device according to Comparative Example 1 of the present invention. Figure 10 is a biometric image of Comparative Example 1 in accordance with the present invention. 11 is a perspective view of an imaging module of a biometric device according to Embodiment 17 to Embodiment 36 of the present invention.

Claims (16)

A biometric device includes: an illumination unit for emitting light to a living body; and an imaging module for receiving light of the illumination unit, the imaging module comprising: a light screening structure comprising a microlens array a refractive focusing layer interposed between the microlens array and the light shielding layer, the microlens array comprising a plurality of microlens units, and the light shielding layer having a plurality of light passing portions; a photosensitive layer for receiving light reflected from the living body, the photosensitive layer having a plurality of photosensitive regions disposed at intervals, the light shielding layer being interposed between the refractive focusing layer and the photosensitive layer, wherein the photosensitive regions respectively correspond to a light passing portion, wherein the light shielding layer and the photosensitive layer have an angular spacing; wherein each of the microlens units has a radius of curvature R, and each of the microlens units has a diameter D, and each of the microlens units has a maximum The thickness is LH, the center spacing of two of the adjacent microlens units is P, the thickness of the refractive focusing layer is H, and the apertures of the light-passing portions are WO, and the light-passing portions are respectively The aspect ratio is AR, the angle of the screening is S, and the width of each of the photosensitive regions is WS, which satisfies the following conditions: AR < 1.0; 0.5 ≦ R/D ≦ 2.86; 0.02 < WO/P < 0.3; (H+LH) × (WS-WO) / (2 × P + WO) ≦ S ≦ (H + LH) × (2 × P - WS - WO) / (2 × P + WO). The biometric device of claim 1, wherein each of the microlens units has a diameter of 35.0 μm (micrometers), and each of the microlens units has a radius of curvature of 17.5 μm to 100.0 μm. The biometric device of claim 1, wherein a center distance of two adjacent photosensitive regions is 50.0 μm, and a diameter of each of the light-passing portions is 1.0 μm to 15.0 μm. The biometric device of claim 1, wherein a center-to-center spacing of two adjacent photosensitive regions is 50.0 μm, and each of the microlens units has a radius of curvature of 40.0 μm, and respective apertures of the light-passing portions The thickness of the refractive focusing layer is 6.0 μm, and the angle between the light shielding layer and the photosensitive layer is 23.0 μm to 61.0 μm. The biometric device of claim 1, wherein the optical screening structure further comprises a spacer layer interposed between the light shielding layer and the photosensitive layer to define the angle screening interval, and the micro The total thickness of the lens array, the refractive focusing layer, the light shielding layer, the spacer layer and the photosensitive layer is less than 3.0 mm (millimeter). The biometric device of claim 1, wherein the microlens units have the same radius of curvature. The biometric device of claim 1, wherein the photosensitive layer comprises a plurality of photosensitive cells arranged at intervals, each of the photosensitive cells having the photosensitive region, and the photosensitive cells respectively corresponding to the microlens units. The biometric device of claim 1, wherein the photosensitive layer comprises a first photosensitive unit and a second photosensitive unit, wherein the first photosensitive unit and the second photosensitive unit each have the photosensitive The microlens unit includes a first lens unit group and a second lens unit group, and the first photosensitive unit and the second photosensitive unit respectively correspond to the first lens unit group and the second lens unit Group. A biometric device includes: an illumination unit for emitting light to a living body; and an imaging module for receiving light of the illumination unit, the imaging module comprising: a light screening structure comprising a microlens array a refractive focusing layer interposed between the microlens array and the light shielding layer, the microlens array comprising a plurality of microlens units, and the light shielding layer having a plurality of light passing portions; a photosensitive layer for receiving light reflected from the living body, the light shielding layer being interposed between the refractive focusing layer and the photosensitive layer, and the light shielding layer and the photosensitive layer have an angular screening interval; wherein the microscopic Each of the lens units has a radius of curvature R, and each of the microlens units has a diameter D, and two of the adjacent microlens units have a center-to-center spacing P, and the respective apertures of the light-passing portions are WO, and the light-passing portions are The respective aspect ratios are AR, and the angle of the screening is S, which satisfies the following conditions: 1.0 ≦ AR < 5.0; 0.6 < R/D ≦ 2.86; 0.02 ≦ WO/P ≦ 0.5; and 0 ≦ S < 3P. The biometric device of claim 9, wherein each of the microlens units has a diameter of 35.0 μm, and each of the microlens units has a radius of curvature of 17.5 μm to 100.0 μm. The biometric device of claim 9, wherein the photosensitive layer comprises a plurality of photosensitive regions arranged at intervals, wherein a center spacing of two adjacent photosensitive regions is 50.0 μm, and each of the light-passing portions The pore diameter is from 1.0 μm to 25.0 μm. The biometric device of claim 9, wherein the photosensitive layer comprises a plurality of photosensitive regions arranged at intervals, wherein a center spacing of two adjacent photosensitive regions is 50.0 μm, and the light shielding layer and the photosensitive portions The angle of the screening interval between the units is 150.0 μm or less. The biometric device of claim 9, wherein the light screening structure further comprises a spacer layer interposed between the light shielding layer and the photosensitive layer to define the angle screening interval, and the micro The total thickness of the lens array, the refractive focusing layer, the light shielding layer, the spacer layer and the photosensitive layer is less than 3.0 mm. The biometric device of claim 9, wherein the microlens units have the same radius of curvature as each other. The biometric device of claim 9, wherein the photosensitive layer comprises a plurality of photosensitive cells arranged at intervals, and the photosensitive cells respectively correspond to the microlens units. The biometric device of claim 9, wherein the photosensitive layer comprises a first photosensitive unit and a second photosensitive unit, wherein the microlens unit comprises a first lens unit group and a second The lens unit group, the first photosensitive unit and the second photosensitive unit respectively correspond to the first lens unit group and the second lens unit group.