TW202207005A - Biometrics sensing device - Google Patents

Abstract

A biometrics sensing device used to sense light beams is provided. The biometrics sensing device includes a substrate, a light sensing element, a first light-blocking layer, a second light-blocking layer and a third light-blocking layer. The light sensing element is disposed on the substrate. Each light-blocking layer has a light-blocking area and a hole. Holes of the three light-blocking layers correspond to each other and correspond to the light sensing element. A first interval d1 exists between the first light-blocking layer and the second light-blocking layer in the normal direction of the substrate. A second interval d2 exists between the second light-blocking layer and the third light-blocking layer in the normal direction of the substrate. Included angles exist between a third hole-center line of the third hole and the light beams and the included angles include a first included angle [theta]1 and a second included angle [theta]2. The third hole has the third hole-width W3, and the first included angle [theta]1, the second included angle [theta]2, the third hole-width W3, the first interval d1 and the second interval d2 meet the following equations: (0.5*W3)/(d1+d2)>|tan[theta]1|, (0.5*W3)/d2<|tan[theta]2|, and 15DEG ≤ ([theta]1 and [theta]2) ≤ 40DEG, wherein [theta]2>[theta]1.

Description

Biometric Sensing Device

The present invention relates to an optical device, and more particularly, to a biometric sensing device.

In recent years, fingerprint recognition technology has been widely used in various electronic devices, such as mobile phones and tablet computers, to provide various identity login or identity verification functions. In the current optical fingerprint recognition sensing device, the light is usually focused on the sensing element through a lens, and the size of the light-transmitting hole decreases almost from top to bottom. Under such an architecture, the fingerprint recognition degree is not high. In simulation, it is almost impossible to distinguish stripes with a period length of less than 300 μm, and the fingerprint identification accuracy is not high. In view of the above situation, how to improve the accuracy of fingerprint identification has become an urgent problem to be solved.

The present invention provides a biometric sensing device with good biometric identification accuracy.

According to an embodiment of the present invention, a biometric sensing device is provided for sensing light, which includes a substrate, at least one light sensing element, a first light shielding layer, a second light shielding layer and a third light shielding layer. At least one light sensing element is disposed on the substrate. The first light shielding layer includes a first light shielding area and at least one first hole, wherein the first light shielding layer is disposed on at least one light sensing element, and the at least one first hole corresponds to the at least one light sensing element. The second light-shielding layer includes a second light-shielding region and at least one second hole, wherein the second light-shielding layer is disposed on the first light-shielding layer, and in the normal direction of the substrate, there is a space between the first light-shielding layer and the second light-shielding layer. The first interval d1, and the at least one second hole corresponds to the at least one first hole. The third light-shielding layer includes a third light-shielding region and at least one third hole, wherein the third light-shielding layer is disposed on the second light-shielding layer, and in the normal direction of the substrate, there is a space between the second light-shielding layer and the third light-shielding layer. The second interval d2, and the at least one third hole corresponds to the at least one second hole. Wherein, at least one third hole has an included angle between the center line of the third hole and the light ray, and the included angle includes a first included angle θ1 and a second included angle θ2, at least one third hole has a third hole width W3, and the first included angle θ1, the second included angle θ2, the third hole width W3, the first interval d1 and the second interval d2 have the following relationships: (0.5*W3)/(d1+d2)>|tanθ1|; (0.5*W3)/d2<|tanθ2|; and 15°≦(θ1 and θ2)≦40°, where θ2>θ1.

Based on the above, the biometric sensing device provided by the embodiment of the present invention has three light-shielding layers and corresponding holes in the light-shielding layer, and the interval between the three light-shielding layers and the width of the holes in the light-shielding layer are appropriately configured to screen the light and improve the Recognition of biometric sensing devices.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

Referring to FIG. 1 , a schematic diagram of a biometric sensing device according to an embodiment of the present invention is shown. The biometric sensing device 1 can be used to sense the light R1 from the user's finger 2 to sense the user's fingerprint for identity registration or identity verification. However, the present invention is not limited to this, and the biometric sensing device 1 can also be used to sense other biometrics other than fingerprints. In a not-shown embodiment, a light source can be arranged to emit light, and at least a part of the light can be reflected by the user's finger 2 , thereby generating the light R1 .

The biometric sensing device 1 according to the embodiment of the present invention includes a substrate 10 , a light sensing element 100 , a first light shielding layer 101 , a second light shielding layer 102 , a third light shielding layer 103 , a microlens 104 and a cover plate 105 . The light sensing element 100 is disposed on the substrate 10 . The first light shielding layer 101 includes a first light shielding region 101B and a first hole 101H, wherein the first light shielding layer 101 is disposed on the light sensing element 100 , and the first hole 101H corresponds to the light sensing element 100 . The second light-shielding layer 102 includes a second light-shielding region 102B and a second hole 102H. The second light-shielding layer 102 is disposed on the first light-shielding layer 101 . In the normal direction of the substrate 10 , the first light-shielding layer 101 and the second light-shielding layer There is a first interval d1 between the light shielding layers 102, and the second hole 102H corresponds to the first hole 101H. The third light-shielding layer 103 includes a third light-shielding region 103B and a third hole 103H, wherein the third light-shielding layer 103 is disposed on the second light-shielding layer 102 , in the normal direction of the substrate 10 , the second light-shielding layer 102 and the third light-shielding layer 102 There is a second space d2 between the light shielding layers 103, and the third hole 103H corresponds to the second hole 102H. The microlens 104 is disposed on the substrate 10, and the microlens 104 corresponds to the third hole 103H.

The third hole 103H has a third hole width W3 and a third hole center line 103C. The third hole center line 103C is defined as a straight line passing through the center of the third hole 103H and parallel to the normal direction of the substrate 10 . The second hole 102H has a second hole width W2 and a second hole centerline 102C. The second hole centerline 102C is defined as a straight line passing through the center of the second hole 102H and parallel to the normal direction of the substrate 10 . The first hole 101H has a first hole width W1 and a first hole center line 101C. The first hole center line 101C is defined as a straight line passing through the center of the first hole 101H and parallel to the normal direction of the substrate 10 . In FIG. 1 , the first hole center line 101C, the second hole center line 102C and the third hole center line 103C are located on the same straight line. However, the present invention is not limited thereto, and the first hole center line 101C, the second hole center line 102C and the third hole center line 103C may be three straight lines that are independent and parallel to each other.

At least a portion of the light R1 from the user's finger 2 transmits through the microlens 104 and passes through the third hole 103H. An included angle θ is formed between the center line 103C of the third hole and the light R1 passing through the third hole 103H, and the included angle θ includes a first included angle θ1 and a second included angle θ2.

In an embodiment of the present invention, the first included angle θ1, the second included angle θ2, the third hole width W3, the first interval d1 and the second interval d2 have the following relationship (Conditional Formula 1): (0.5*W3)/(d1+d2)>|tanθ1|; (0.5*W3)/d2<|tanθ2|; and 15°≦(θ1 and θ2)≦40°, where θ2>θ1.

In Conditional Formula 1, the relationship between the third hole width W3 and the first interval d1 and the second interval d2 is defined, and the magnitudes of the first included angle θ1 and the second included angle θ2 are defined. For the purpose of clear description, the above relationship is further defined by taking the absolute value of the tangent of the first included angle θ1 and the absolute value of the tangent of the second included angle θ2. With the above-mentioned restrictions on the third hole width W3 , the first interval d1 and the second interval d2 , the light R1 is screened, so that the biometric sensing device 1 has good identification accuracy.

In another embodiment of the present invention, the first included angle θ1, the second included angle θ2, the third hole width W3, the first interval d1, and the second interval d2 satisfy the relationship defined by the above-mentioned conditional formula 1, and the ray R1 is also related to The center line 102C of the second hole defines an included angle θ, and the included angle θ includes a third included angle θ3 and a fourth included angle θ4. The third angle θ3, the fourth angle θ4, the third hole width W3, the second hole width W2 and the second interval d2 have the following relationship (Conditional Formula 2): 2μm≦W2≦20μm; |tanθ3| <{[(0.5*W3)-(0.5*W2)]/d2}<|tanθ4|; and 15°≦(θ3 and θ4)≦40°, where θ4>θ3.

In Conditional Formula 2, the relationship between the third hole width W3, the second hole width W2 and the second interval d2 is defined, and the sizes of the second hole width W2, the third included angle θ3 and the fourth included angle θ4 are defined. The size of the second hole 102H is between 2 μm and 20 μm, which screens the light R1 to improve the recognition accuracy of the biometric sensing device 1 . For the purpose of clear description, the above relationship is further defined by taking the absolute value of the tangent of the third included angle θ3 and the absolute value of the tangent of the fourth included angle θ4. With the above-mentioned restrictions on the second hole width W2 , the third hole width W3 and the second interval d2 , the light R1 is screened, so that the biometric sensing device 1 has good identification accuracy.

In another embodiment of the present invention, the first included angle θ1, the second included angle θ2, the third hole width W3, the first interval d1, and the second interval d2 satisfy the relationship defined by the above-mentioned conditional formula 1, and the ray R1 is also related to The center line 101C of the first hole defines an included angle θ, and the included angle θ includes a fifth included angle θ5 and a sixth included angle θ6. The fifth included angle θ5, the sixth included angle θ6, the first hole width W1 and the first interval d1 have the following relationship (Conditional Formula 3): |tanθ5| <(W1/d1)<|tanθ6|; and 15°≦(θ5 and θ6)≦40°, where θ6>θ5.

In Conditional Formula 3, the relationship between the first hole width W1 and the first interval d1 is defined, and the sizes of the fifth included angle θ5 and the sixth included angle θ6 are defined. For the purpose of clear description, the above relationship is further defined by taking the absolute value of the tangent of the fifth included angle θ5 and the absolute value of the tangent of the sixth included angle θ6. With the above-mentioned restrictions on the first hole width W1 and the first interval d1 , the light R1 is screened, so that the biometric sensing device 1 has good identification accuracy.

In another embodiment of the present invention, the first included angle θ1 to the sixth included angle θ6 , the first hole width W1 to the third hole width W3 , the first interval d1 and the second interval d2 simultaneously satisfy the above-mentioned conditional formula 1 and conditional formula 2 and conditional expression 3. With the above-mentioned restrictions on the first hole width W1 to the third hole width W3, the first interval d1 and the second interval d2, the light R1 is screened, so that the biometric sensing device 1 has good identification accuracy.

In an embodiment of the present invention, the first interval d1 and the second interval d2 conform to the following relationship (Conditional Expression 4): d1≦d2; and 1≦(d2/d1)≦20.

In Conditional Expression 4, the magnitude relationship between the first interval d1 and the second interval d2 is defined. Specifically, the second interval d2 between the third light shielding layer 103 and the second light shielding layer 102 is greater than the first interval d1 between the second light shielding layer 102 and the first light shielding layer 101 . According to another embodiment of the present invention, the first interval d1 and the second interval d2 more conform to the following relationship (Conditional Formula 5): 1≦(d2/d1)≦3.

In an embodiment of the present invention, taking the second hole centerline 102C as a reference, the shortest distance between the center of the first hole 101H and the second hole centerline 102C is not greater than 5 μm, and the center of the third hole 103H and the third hole The shortest distance between the centerlines 102C of the two holes is not greater than 5 μm. In an embodiment of the present invention, the center of the first hole 101H is located on the extension line of the center line 102C of the second hole, in other words. The shortest distance between the center of the first hole 101H and the center line 102C of the second hole is zero. In an embodiment of the present invention, the center of the third hole 103H is located on the extension line of the center line 102C of the second hole, in other words. The shortest distance between the center of the third hole 103H and the center line 102C of the second hole is zero. In an embodiment of the present invention, the shortest distance between the center of the first hole 101H and the center line 102C of the second hole is 5 μm. In an embodiment of the present invention, the shortest distance between the center of the third hole 103H and the center line 102C of the second hole is 5 μm.

In FIG. 1 , the first hole center line 101C, the second hole center line 102C and the third hole center line 103C are located on the same straight line. However, the present invention is not limited thereto. According to an embodiment of the present invention, the first hole center line 101C, the second hole center line 102C and the third hole center line 103C may be three independent and parallel lines. According to an embodiment of the present invention, two of the first hole center line 101C, the second hole center line 102C and the third hole center line 103C are coincident.

In FIG. 1 , the number of the light sensing element 100 , the first hole 101H, the second hole 102H, the third hole 103H and the microlens 104 is all two. However, the present invention is not limited to this. In some embodiments of the present invention, the number of the light sensing element 100 , the first hole 101H, the second hole 102H, the third hole 103H and the microlens 104 is N, where N is A positive integer greater than or equal to 1.

In some embodiments of the present invention, the numbers of the light sensing elements 100 , the first holes 101H, the second holes 102H, the third holes 103H and the microlenses 104 are the same as each other. However, the present invention is not limited to this. In some embodiments of the present invention, the numbers of at least two of the light sensing element 100 , the first hole 101H, the second hole 102H, the third hole 103H and the microlens 104 are different from each other. same.

In some embodiments of the present invention, each light sensing element 100 corresponds to a plurality of first holes 101H, a plurality of second holes 102H, a plurality of third holes 103H, and a plurality of microlenses 104, wherein the plurality of first holes The number of 101H, the plurality of second holes 102H, the plurality of third holes 103H and the plurality of microlenses 104 is the same. In some embodiments of the present invention, each light sensing element 100 corresponds to a plurality of first holes 101H, a plurality of second holes 102H, a plurality of third holes 103H or a plurality of microlenses 104 .

The cover plate 105 is disposed on the light sensing element 100 , the first light shielding layer 101 , the second light shielding layer 102 and the third light shielding layer 103 , and the cover plate 105 includes at least one of a display panel, a touch panel and a protection plate.

According to an embodiment of the present invention, the biometric sensing device 1 further includes a first dielectric layer DI1 between the first light shielding layer 101 and the second light shielding layer 102 , and between the second light shielding layer 102 and the third light shielding layer 103 of the second dielectric layer DI2. According to an embodiment of the present invention, the first dielectric layer DI1 and the second dielectric layer DI2 include the same material.

According to an embodiment of the present invention, the biometric sensing device 1 further includes a third dielectric layer DI3 between the first light shielding layer 101 and the light sensing element 100 . According to an embodiment of the present invention, the biometric sensing device 1 includes a first dielectric layer DI1 between the first light shielding layer 101 and the second light shielding layer 102 , a first dielectric layer DI1 between the second light shielding layer 102 and the third light shielding layer 103 Two dielectric layers DI2 and a third dielectric layer DI3 between the first light shielding layer 101 and the light sensing element 100 . According to an embodiment of the present invention, the first dielectric layer DI1 , the second dielectric layer DI2 and the third dielectric layer DI3 include the same material. However, the present invention is not limited to this. According to an embodiment of the present invention, the first dielectric layer DI1 , the second dielectric layer DI2 and the third dielectric layer DI3 do not include the same material. According to another embodiment of the present invention, two of the first dielectric layer DI1 , the second dielectric layer DI2 and the third dielectric layer DI3 include the same material, and the other includes a different material.

According to an embodiment of the present invention, each of the first dielectric layer DI1 , the second dielectric layer DI2 and the third dielectric layer DI3 may be a single-layer structure or a multi-layer structure, and the materials may include organic materials, inorganic materials material or a mixture of organic and inorganic materials.

Referring to FIG. 2A and FIG. 2B , FIG. 2A is a simulation recognition result of a biometric sensing technology according to a conventional technology, and FIG. 2B is a recognition result of a biometric sensing device according to an embodiment of the present invention. Specifically, FIG. 2A is a simulation result of identifying bright and dark patterns with a length period of 300 μm by a conventional technique, and FIG. 2B is a biometric sensing device provided by an embodiment of the present invention to identify bright and dark patterns with a length period of 300 μm. the result of. Both FIGS. 2A and 2B represent the simulation results with two-dimensional luminance graphs, and the luminance graphs on the right side of FIGS. 2A and 2B are in arbitrary units. It can be seen that, because the biometric sensing device provided by the embodiment of the present invention has the light screening mechanism described in the above embodiments, the recognition result shown in FIG. 2B is clearer than the recognition result shown in FIG. The biometric sensing device of the embodiment of the present invention has good identification accuracy.

Referring to FIGS. 3A and 3B , FIGS. 3A and 3B are the results of identifying bright and dark patterns with a length period of 400 μm by the biometric sensing device provided by the embodiment of the present invention, wherein the biometric sensing device corresponding to FIG. 3A conforms to the Conditional Equation 1, the biometric sensing device corresponding to FIG. 3B complies with Conditional Equation 1 to Conditional Equation 5. Both FIGS. 3A and 3B are two-dimensional luminance maps to represent the simulation results, and the luminance tables on the right side of FIGS. 3A and 3B are in arbitrary units. As shown in FIG. 3A , the biometric sensing device that complies with the conditional formula 1 provides a good identification result for bright and dark patterns with a length period of 400 μm. In addition, as shown in FIG. 3B , the biometric sensing devices that meet the conditional expressions 1 to 5 provide better identification results for bright and dark patterns with a length period of 400 μm.

To sum up, the biometric sensing device provided by the embodiments of the present invention has three light-shielding layers and corresponding holes in the light-shielding layer, and the interval between the three light-shielding layers and the width of the holes in the light-shielding layer are appropriately configured to screen the light. Improve the recognition of biometric sensing devices.

1: Biometric Sensing Device 2: Fingers 10: Substrate 100: Light sensing element 101: The first shading layer 101C: Centerline of the first hole 101B: First shading area 101H: The first hole 102: Second shading layer 102C: Centerline of the second hole 102B: Second shading area 102H: The second hole 103: The third shading layer 103C: Centerline of the third hole 103B: Third shading area 103H: The third hole 104: Micro lens 105: Cover d1: first interval d2: second interval DI1: first dielectric layer DI2: Second Dielectric Layer DI3: Third Dielectric Layer R1: light W1: first hole width W2: Second hole width W3: third hole width θ: included angle

FIG. 1 is a schematic diagram of a biometric sensing device according to an embodiment of the present invention. FIG. 2A is a simulation recognition result of the biometric sensing technology according to the prior art. 2B to 3B are recognition results of the biometric sensing device according to an embodiment of the present invention.

1: Biometric Sensing Device

2: Fingers

10: Substrate

100: Light sensing element

101: The first shading layer

101C: Centerline of the first hole

101B: First shading area

101H: The first hole

102: Second shading layer

102C: Centerline of the second hole

102B: Second shading area

102H: The second hole

103: The third shading layer

103C: Centerline of the third hole

103B: Third shading area

103H: The third hole

104: Micro lens

105: Cover

d1: first interval

d2: second interval

DI1: first dielectric layer

DI2: Second Dielectric Layer

DI3: Third Dielectric Layer

R1: light

W1: first hole width

W2: Second hole width

W3: third hole width

θ: included angle

Claims (11)

A biometric sensing device for sensing a light, comprising: a substrate; at least one light sensing element disposed on the substrate; a first light-shielding layer including a first light-shielding region and at least one first hole, wherein the first light-shielding layer is disposed on the at least one light sensing element, and the at least one first hole corresponds to the at least one light sensing element; a second light-shielding layer, comprising a second light-shielding region and at least one second hole, wherein the second light-shielding layer is disposed on the first light-shielding layer, and in a normal direction of the substrate, the first light-shielding layer There is a first interval d1 between the second light shielding layer and the at least one second hole corresponding to the at least one first hole; a third light-shielding layer, comprising a third light-shielding region and at least one third hole, wherein the third light-shielding layer is disposed on the second light-shielding layer, and in the normal direction of the substrate, the second light-shielding layer There is a second interval d2 between the third light shielding layer and the at least one third hole corresponding to the at least one second hole; Wherein, a centerline of a third hole of the at least one third hole forms an included angle with the light ray, and the included angle includes a first included angle θ1 and a second included angle θ2, and the at least one third hole has a third hole Width W3, and the first angle θ1, the second angle θ2, the third hole width W3, the first interval d1 and the second interval d2 have the following relationship: (0.5*W3)/(d1+d2)>|tanθ1|; (0.5*W3)/d2<|tanθ2|; and 15°≦(θ1 and θ2)≦40°, where θ2>θ1. The biometric sensing device as claimed in claim 1, wherein a centerline of a second hole of the at least one second hole and the light are formed with the included angle, and the included angle includes a third included angle θ3 and a fourth included angle θ4, the at least one second hole has a second hole width W2, and the third angle θ3, the fourth angle θ4, the third hole width W3, the second hole width W2 and the second interval d2 have the following relation: 2μm≦W2≦20μm; |tanθ3| <{[(0.5*W3)-(0.5*W2)]/d2}<|tanθ4|; and 15°≦(θ3 and θ4)≦40°, where θ4>θ3. The biometric sensing device as claimed in claim 1, wherein a centerline of a first hole of the at least one first hole and the light are formed with the included angle, and the included angle includes a fifth included angle θ5 and a sixth included angle θ6, the at least one first hole has a first hole width W1, and the fifth included angle θ5, the sixth included angle θ6, the first hole width W1 and the first interval d1 have the following relationship: |tanθ5| <(W1/d1)<|tanθ6|; and 15°≦(θ5 and θ6)≦40°, where θ6>θ5. The biometric sensing device of claim 1, wherein d1≦d2, and 1≦(d2/d1)≦20. The biometric sensing device of claim 4, wherein 1≦(d2/d1)≦3. The biometric sensing device as claimed in claim 1, wherein with a second hole centerline of the at least one second hole as a reference, the shortest distance between the center of the at least one first hole and the centerline of the second hole The distance is not greater than 5 μm, and the shortest distance between the center of the at least one third hole and the center line of the second hole is not greater than 5 μm. The biometric sensing device of claim 1, wherein a centerline of the third hole, a centerline of a second hole of the at least one second hole, and a centerline of a first hole of the at least one first hole At least the two overlap. The biometric sensing device of claim 1, further comprising at least one microlens disposed on the substrate, and the at least one microlens corresponds to the at least one third hole. The biometric sensing device according to any one of claims 1 to 8, further comprising a cover plate disposed on the at least one light sensing element, the first light shielding layer, the second light shielding layer and the third light shielding layer on the light shielding layer, and the cover plate includes at least one of a display panel, a touch panel and a protection plate. The biometric sensing device of claim 1, wherein a first dielectric layer is disposed between the first light shielding layer and the second light shielding layer, and a first dielectric layer is disposed between the second light shielding layer and the third light shielding layer a second dielectric layer. The biometric sensing device of claim 1, wherein a third dielectric layer is disposed between the first light shielding layer and the at least one light sensing element.

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