TWI664581B - Optical fingerprint sensor - Google Patents

Abstract

The invention provides an optical fingerprint sensor. The light emitting layer is disposed under the cover glass and includes a plurality of light emitting units. The light emitting unit includes a light source region and a light transmitting region. The light emitting element is disposed in the light source area to provide light to the cover glass. The light sensing layer includes a plurality of light sensors arranged in an array. The filter layer is disposed between the light sensing layer and the light emitting layer, and includes a plurality of collimators arranged in a specific pattern. The number of the collimators is greater than the number of the light sensors. The number of the light sensors is greater than the number of the light emitting units. At least one of the two adjacent light sensors will receive the light irradiated to a user placed above the cover glass through the light transmission area of the light emitting unit and the collimators. Reflected light from fingers.

Description

   Optical fingerprint sensor   

The invention relates to an optical fingerprint sensor, and in particular to an optical fingerprint sensor made by combining a panel module and a sensing module.

In recent years, as biometric technologies have matured, many different biometrics can be used to identify users. Among them, because the recognition rate and accuracy of fingerprint recognition technology are better than those of other biological features, the current application of fingerprint recognition is wider.

The fingerprint recognition technology uses a sensing device to first sense the user's fingerprint pattern, and then captures unique fingerprint features in the fingerprint pattern and stores them in memory, or directly stores the fingerprint pattern. Afterwards, when the user presses or swipes the fingerprint again, the fingerprint sensor will sense the fingerprint pattern and capture the fingerprint characteristics, so as to compare with the previously stored fingerprint characteristics for identification, or directly with the previously stored fingerprint characteristics. The fingerprint pattern is compared. If they match, the identity of the user is confirmed.

FIG. 1 shows a conventional optical fingerprint sensor 1. In the conventional optical fingerprint sensor 1, the light emitting unit Cell of the panel module 51, the light sensor 26 and the collimator 36 of the sensor module 11 have the same number. In addition, each light sensor 26 uses only a single collimator 36, so the single collimator 36 must be aligned with the light-transmitting area Z2 of the light-emitting unit Cell in the panel module 51 to prevent the single collimator 36 from being illuminated. The non-transmissive area Z1 of the cell Cell is covered so that light cannot reach the light sensor 26 below the single collimator 36. Therefore, in the conventional optical fingerprint sensor 1, when the sensing module 11 and the panel module 51 are combined, the light sensor 26 of the sensing module 11 and the light-emitting unit Cell of the panel module 51 need to be combined. The light-transmitting area Z2 is aligned, and when the sensing module 11 is manufactured, the light sensor 26 and the collimator 36 must also be aligned to avoid that the single collimator 36 will be blocked by the non-light-transmitting area Z1 of the panel module 51. The covered or light sensor 26 cannot receive the light emitted by the light emitting unit Cell and reflected back to the user's finger.

The invention provides an optical fingerprint sensor. The optical fingerprint sensor includes a panel module and a sensing module. The panel module includes a cover glass and a light emitting layer disposed under the cover glass. The light emitting layer includes a plurality of light emitting units. Each of the light emitting units includes: a light source region, wherein a light emitting element is disposed in the light source region to provide light to the cover glass; and a light transmitting region. The sensing module includes a light sensing layer including a plurality of light sensors arranged in an array, and a filter layer disposed between the light sensing layer and the light emitting layer of the panel module. The filter layer includes a plurality of collimators arranged in a specific pattern. The number of the collimators is greater than the number of the light sensors, and the number of the light sensors is greater than the number of the light emitting units. At least one of the two adjacent light sensors will receive the light irradiated to a user placed above the cover glass through the light transmission area of the light emitting unit and the collimators. Reflected light from fingers.

Furthermore, the present invention provides another optical fingerprint sensor. The optical fingerprint sensor includes a panel module and a sensing module. The panel module includes a cover glass and a light emitting layer disposed under the cover glass. The light emitting layer includes a plurality of light emitting units. Each of the light emitting units includes: a light source region, wherein a light emitting element is disposed in the light source region to provide light to the cover glass; and a light transmitting region. The sensing module includes a light sensing layer and a filter layer. The light sensing layer includes a plurality of light sensors arranged in an array. The filter layer includes a plurality of collimators arranged in a specific pattern. The number of the collimators is greater than the number of the light sensors, and the number of the light sensors is greater than the number of the light emitting units. At least two of the four consecutive adjacent light sensors will receive the light shining through a light transmitting unit and the collimator to a user placed above the cover glass. Light reflected by fingers.

Furthermore, the present invention provides another optical fingerprint sensor. The optical fingerprint sensor includes a panel module and a sensing module. The panel module includes a cover glass and a light emitting layer disposed under the cover glass. The light emitting layer includes a plurality of light emitting units. Each of the light emitting units includes: a light source region, wherein a light emitting element is disposed in the light source region to provide light to the cover glass; and a light transmitting region. The sensing module includes a light sensing layer and a filter layer. The light sensing layer includes a plurality of light sensors arranged in an array. The filter layer includes a plurality of collimators arranged in a specific pattern. The number of the collimators is greater than the number of the light sensors, and the number of the light sensors is greater than the number of the light emitting units. Some of the light sensors receive reflected light from the light shining on a finger of a user placed above the cover glass through the light-transmitting area of the light-emitting units and some of the collimators. Some of the light sensors and some of the collimators will be completely covered by the light source area of the light emitting units.

10A, 10B, 10C, 10D, 11‧‧‧ sensor modules

20, 21‧‧‧ light sensing layer

25, 25_1-25_8, 26‧‧‧ light sensors

30, 31‧‧‧ Filter

35, 36‧‧‧ Collimator

40‧‧‧finger

50A, 50B, 50C, 50D, 51‧‧‧ panel modules

60, 61‧‧‧ Covered glass

70, 71‧‧‧ luminescent layer

80, 81‧‧‧ light-emitting elements

90‧‧‧ light source

95‧‧‧ reflected light

Cell, Cell_1-Cell_4‧‧‧light-emitting unit

Z1‧‧‧light source area

Z2‧‧‧Translucent area

1, 100A, 100B, 200A, 200B, 200C‧‧‧Optical fingerprint sensor

FIG. 1 shows a conventional optical fingerprint sensor; FIG. 2 shows an optical fingerprint sensor according to some embodiments of the present invention; and FIG. 3A shows an array method according to some embodiments of the present invention. Aligned collimators; Figure 3B shows collimators arranged in a staggered manner according to some embodiments of the present invention; Figure 4 shows optical fingerprint sensors according to some embodiments of the present invention; Figure 5 shows an optical fingerprint sensor according to some embodiments of the invention; Figure 6 shows an optical fingerprint sensor according to some embodiments of the invention; and Figure 7 shows some implementations according to the invention The optical fingerprint sensor described in the example.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the following describes the preferred embodiments in detail with the accompanying drawings, as follows: Figure 2 shows some aspects of the present invention. The optical fingerprint sensor 100A described in the embodiment. The optical fingerprint sensor 100A includes a sensing module 10 and a panel module 50. The sensing module 10 is disposed below the panel module 50. The optical fingerprint sensor 100A is formed by combining the sensing module 10 and the panel module 50. In this embodiment, the sensing module 10 is coupled to the panel module 50 via an adhesive (not shown).

The panel module 50 includes a cover glass 60 and a light emitting layer 70. The light emitting layer 70 includes a light emitting array including a plurality of light emitting cells Cell. In this embodiment, the light-emitting cells Cell_1-Cell_4 are used for illustration only, and are not intended to limit the present invention. The cover glass 60 is an insulating surface and is disposed on the light emitting layer 70 to cover the light emitting array. Each light-emitting unit Cell_1-Cell_4 has a light source region Z1 and a light-transmitting region Z2. The light source region Z1 includes a light emitting element 80. In some embodiments, the panel module 50 is an organic light emitting diode (OLED) panel, and the light emitting element 80 is an organic light emitting diode (OLED). In some embodiments, the panel module 50 is a micro-LED panel, and the light-emitting element 80 is a micro-LED.

In FIG. 2, the length of the light source region Z1 of the light emitting unit Cell in the x direction is L3, and the length of the light transmitting region Z2 of the light emitting unit Cell in the x direction is L4. In some embodiments, the length L3 of the light source region Z1 is approximately the same as the length L4 of the light transmitting region Z2. The light emitting cells Cell_1-Cell_4 are arranged at the same pitch L34 in the x direction. In addition, each light-transmitting region Z2 is disposed between the light-emitting regions Z1 of two adjacent light-emitting units Cell, and each light-emitting region Z1 is disposed between the light-transmitting regions Z2 of two adjacent light-emitting units Cell. For example, the light-transmitting area Z2 of the light-emitting unit Cell_2 is disposed between the light-emitting area Z1 of the light-emitting unit Cell_2 and the light-emitting area Z1 of the light-emitting unit Cell_3, and the light-emitting area Z1 of the light-emitting unit Cell_3 is the light-transmitting area Z2 of the light-emitting unit Cell_2. And between the light-transmitting area Z2 of the light-emitting unit Cell_3.

In some embodiments, the light-emitting unit Cell_2 is taken as an example to illustrate that the interval L34 of the light-emitting unit Cell_2 is equal to the sum of the length L3 of the light source region Z1 and the length L4 of the light-transmitting region Z2, that is, L34 = L3 + L4. In some embodiments, the interval L34 of the light-emitting unit Cell_2 is greater than the sum of the length L3 of the light source region Z1 and the length L4 of the light-transmitting region Z2, that is, L34> L3 + L4.

The sensing module 10 includes a light sensing layer (or a light receiving layer) 20 and a filter layer 30. The filter layer 30 of the sensing module 10 may be bonded to the light emitting layer 70 of the panel module 50 via an adhesive. The light sensing layer 20 includes a plurality of light sensors 25 arranged in an array. The number of the light sensors 25 included in the light sensing layer 20 is greater than the number of the light emitting cells Cell included in the light emitting layer 70. For example, in FIG. 2, the light sensing layer 20 includes eight light sensors 25_1-25_8, and the light emitting layer 70 includes four light emitting cells Cell_1-Cell_4. In one embodiment, the light sensor 25 is a photodiode. In the x-direction, the length of each light sensor 25 is L1, and the space between two adjacent light sensors 25 is L2. Furthermore, the light sensors 25 are arranged at the same pitch L12 in the x direction, that is, L12 = L1 + L2.

The filter layer 30 is formed of a material that blocks light (for example, blocks light, absorbs light, or does not transmit light). The filter layer 30 has a plurality of collimators 35 arranged in a specific pattern. In some embodiments, the collimators 35 are arranged in the filter layer 30 in an array manner, as shown in FIG. 3A. In some embodiments, the collimators 35 are arranged in the filter layer 30 in a staggered manner (eg, a honeycomb pattern), as shown in FIG. 3B. The light passes through the collimator 35 in the filter layer 30 and reaches the light sensing layer 20 below. In some implementations, the collimator 35 is an opening in the filter layer 30 so that light can pass from one side of the filter layer 30 to the other side of the filter layer 30. In addition, each collimator 35 has the same opening shape and size (for example, the aperture L5). In a specific pattern, the collimators 35 have the same pitch L6. In some embodiments, the aperture L5 of the collimator 35 is between 1-20 micrometers (μm). In addition, the ratio of the aperture L5 to the height H1 of the collimator is between 1: 3 and 1:20. The aperture L5 is smaller than the length L4 of the light-transmitting region Z2.

It is worth noting that the pitch L6 of the collimator 35 is smaller than the pitch L12 of the light sensor 25. Therefore, the number of collimators 35 is greater than the number of light sensors 25, and according to different applications, the distance ratio between the light sensors 25 and the collimators 35 can be appropriately controlled, so that light can pass through multiple collimators The collimator 35 reaches the same light sensor 25. Compared with the conventional optical fingerprint sensor, in the optical fingerprint sensor 100A of FIG. 2, since the number of collimators 35 is more than the number of light sensors 25, one light sensor 25 can receive Light passing through multiple collimators 35, so when making the sensing module 10, it is not necessary to consider the alignment relationship between the collimator 35 and the light sensor 25, that is, there is no need to combine the collimator 35 and the light sensor The tester 25 performs alignment. In addition, since the number of the light sensors 25 is more than the number of the light emitting cells Cell, when the sensing module 10 is combined with the panel module 50, it is not necessary to consider both the sensing module 10 and the panel module 50. The alignment relationship therebetween, that is, there is no need to align the light sensor 25 with the light emitting unit Cell. Therefore, the manufacturing process of the optical fingerprint sensor 100A can be simplified and the yield can be improved. For example, in different embodiments, the number of the light sensors 25 included in the light sensing layer 20 is approximately one, two, three, or four times the number of the light emitting cells Cell included in the light emitting layer 70, and the light emitting units The pitch L34 of the cells is approximately one, two, three or four times the pitch L12 of the light sensor 25.

In FIG. 2, when the finger 40 contacts the optical fingerprint sensor 100A, the light-emitting element 80 in the light source region Z1 of the light-emitting unit Cell emits light 90, and the light 90 penetrates the cover glass 60 and irradiates the finger 40. The reflected light 95 generated from the surface reflected by the finger 40 passes through the collimator 35 of the filter layer 30 in the sensing module 10 and reaches the light sensing layer 20. The light sensor of the light sensing layer 20 senses the reflected light 95. The fingerprint ridge and the fingerprint valley of the finger 40 will generate different reflected light 95, such as different light energy or light wavelength. After receiving the reflected light 95, each light sensor 25 converts the received reflected light 95 into a sensing output and provides the sensing output to a processor (not shown) or other subsequent circuits to obtain a finger 40 fingerprint information. As shown in Figure 2, each light sensor 25 is partially covered by the light source zone Z1 of the light emitting unit Cell, and each light sensor can receive the light emitted by two adjacent light emitting units Cell and The reflected light 95 reflected from the finger 40. For example, the light-emitting element 80 will provide light 90 to irradiate the finger 40 and generate a reflected light 95, and the reflected light 95 from the finger 40 will pass through the light-transmitting area Z2 of the light-emitting unit Cell_2 and the multiple collimation located below the light-transmitting area Z2. The sensor 35 reaches the light sensors 25_4 and 25_5. Since each light sensor 25 corresponds to a plurality of collimators 35, when a part of the collimators 35 on the light sensor 25 is covered by the light source zone Z1 of the light emitting unit Cell above, the light sensors 25 can receive the reflected light 95 through the other collimator 35 which is not covered. Therefore, according to the sensing output provided by each light sensor 25, the optical fingerprint sensor 100A can obtain fingerprint information of the finger 40.

FIG. 4 shows an optical fingerprint sensor 100B according to some embodiments of the present invention. The optical fingerprint sensor 100B includes a sensing module 10A and a panel module 50A. In the optical fingerprint sensor 100A in FIG. 2, each light sensor 25 is partially covered by the light source region Z1 of the light emitting unit Cell above. However, in the optical fingerprint sensor 100B of FIG. 4, every two adjacent light sensors 25 will have one light sensor 25 almost completely covered by the light source area of the light-emitting unit Cell above it. Z1 is covered. For example, taking two adjacent light sensors 25_3 and 25_4 as an example, the light sensor 25_3 will be almost completely covered by the light source region Z1 of the light emitting unit Cell_2. The light-emitting element 80 will provide light 90 to irradiate the finger 40 and generate reflected light 95, and the reflected light 95 from the finger 40 will reach the light through the light-transmitting area Z2 of the light-emitting unit Cell_3 and the collimator 35 located below the light-transmitting area Z2. Sensor 25_2. Since one of the two light sensors 25 is almost completely covered by the light source zone Z1 of the light emitting unit Cell above, the processor does not need to read the sensing output of each light sensor The fingerprint information of the finger 40 can be obtained only by reading the sensing output of one of the two adjacent light sensors, thereby reducing the amount of calculation and speeding up processing, and reducing the optical The power consumption of the fingerprint sensor 100B.

In some embodiments, the length of the optical sensor 25 of the optical fingerprint sensors 100A and 100B is 21 micrometers (for example, L1 = 21), and the interval between two adjacent optical sensors 25_1 and 25_2 is 1 micrometer. (E.g. L2 = 1). In addition, the pitch L34 of the light-emitting unit Cell is 44 micrometers, and the lengths of the light source region Z1 and the light-transmitting region Z2 are each about 22 micrometers. In one embodiment, the diameter of the collimator 35 is about 5 micrometers (for example, L5 = 5). In other embodiments, the aperture of the collimator 35 may be determined according to the actual application. In this embodiment, the number of light sensors 25 (for example, light sensors 25_1-25_8) included in the light sensing layer 20 is approximately the number of light emitting cells (for example, light emitting cells Cell_1) included in the light emitting layer 70. -Cell_4), and the pitch L34 of the light emitting cell Cell is about twice the pitch L12 of the light sensor 25. As described previously, the light sensor 25 of the sensing module 10A and the light emitting unit Cell of the panel module 50A need not be aligned. Therefore, the manufacturing process of the optical fingerprint sensor 100B can be simplified and the yield can be improved.

FIG. 5 shows an optical fingerprint sensor 200A according to some embodiments of the present invention. The optical fingerprint sensor 200A includes a sensing module 10B and a panel module 50B. The sensing module 10B is disposed below the panel module 50B. The optical fingerprint sensor 200A is formed by combining the sensing module 10B and the panel module 50B. In this embodiment, the sensing module 10B is coupled to the panel module 50B via an adhesive (not shown).

The panel module 50B includes a cover glass 60 and a light emitting layer 70. The light emitting layer 70 includes a light emitting array including a plurality of light emitting cells Cell. In this embodiment, the light-emitting cells Cell_1-Cell_2 are used for illustration only, and are not intended to limit the present invention. The cover glass 60 is an insulating surface and is disposed on the light emitting layer 70 to cover the light emitting array. As described previously, each of the light emitting cells Cell_1 and Cell_2 has a light source region Z1 and a light transmitting region Z2, and the light source region Z1 includes a light emitting element 80. In some embodiments, the light emitting element 80 is an organic light emitting diode or a thin film transistor.

In FIG. 5, the length of the light source region Z1 of the light emitting unit Cell in the x direction is L3, and the length of the light transmitting region Z2 of the light emitting unit Cell in the x direction is L4. In some embodiments, the length L3 of the light source region Z1 is approximately the same as the length L4 of the light transmitting region Z2. The light emitting cells Cell_1 and Cell_2 are arranged at the same pitch L34 in the x direction. As described previously, each light-transmitting region Z2 is disposed between two light-emitting regions Z1 of two adjacent light-emitting cells Cell, and each light-emitting region Z1 is disposed between two light-emitting regions Z2 of two adjacent light-emitting cells Cell. between. In some embodiments, the light-emitting unit Cell_2 is taken as an example for illustration. The interval L34 of the light-emitting unit Cell_2 is equal to the sum of the length L3 of the light source region Z1 and the length L4 of the light-transmitting region Z2, that is, L34 = L3 + L4. In some embodiments, the interval L34 of the light-emitting unit Cell_2 is greater than the sum of the length L3 of the light source region Z1 and the length L4 of the light-transmitting region Z2, that is, L34> L3 + L4.

The sensing module 10B includes a light sensing layer (or a light receiving layer) 20 and a filter layer 30. The light sensing layer 20 includes a plurality of light sensors 25 arranged in an array. The number of the light sensors 25 included in the light sensing layer 20 is greater than the number of the light emitting cells Cell included in the light emitting layer 70. In one embodiment, the light sensor 25 is a photodiode. As described previously, the length of each light sensor 25 is L1, and the interval between two adjacent light sensors 25 is L2. Furthermore, the light sensors 25 are arranged at the same pitch L12 in the x direction, that is, L12 = L1 + L2. In FIG. 5, the length of the light source region Z1 of the light-emitting unit Cell is approximately the sum of the lengths of the two light sensors 25. Therefore, the light source region Z1 of the light-emitting unit Cell will almost completely cover the two light sensors 25.

As described previously, the light passes through the collimator 35 of the filter layer 30 and reaches the light sensing layer 20 below. The collimators 35 are arranged in the filter layer 30 with a specific pattern (for example, the array method in FIG. 3A or the interlaced method in FIG. 3B). In a specific pattern, the collimators 35 have the same pitch L6. In some embodiments, the aperture L5 of the collimator 35 is between 1-20 micrometers (μm). In addition, the ratio of the aperture L5 to the height H1 of the collimator is between 1: 3 and 1:20. The aperture L5 is smaller than the length L4 of the light-transmitting region Z2. Moreover, the pitch L6 of the collimator 35 is smaller than the pitch L12 of the photo sensor 25. The number of collimators 35 is greater than the number of light sensors 25, and according to different applications, the distance ratio between the light sensors 25 and the collimators 35 can be appropriately controlled so that light can pass through multiple collimators 35 arrives at the same light sensor 25. In this embodiment, the number of light sensors 25 (for example, light sensors 25_1-25_8) included in the light sensing layer 20 is approximately the number of light emitting cells (for example, light emitting cells Cell_1) included in the light emitting layer 70. -Cell_2), and the pitch L34 of the light-emitting cell Cell is about four times the pitch L12 of the light sensor 25.

In FIG. 5, when the finger 40 contacts the optical fingerprint sensor 200A, the light-emitting element 80 in the light source region Z1 of the light-emitting unit Cell emits light 90, and the light 90 penetrates the cover glass 60 and irradiates the finger 40. The reflected light 95 generated from the surface of the finger 40 passes through the collimator 35 of the filter layer 30 in the sensing module 10B and reaches the light sensing layer 20. After receiving the reflected light 95, each light sensor 25 converts the received reflected light 95 into a sensing output (such as voltage or current) and provides the sensing output to a processor (not shown) or other Subsequent circuit to obtain fingerprint information of finger 40. According to the fingerprint information of the finger 40, the processor can determine that the sensing voltage corresponds to the fingerprint peak or the fingerprint trough of the finger 40. For example, the light source area Z1 of the light emitting unit Cell_1 will partially cover the light sensors 25_1 and 25_2, and the light source area Z1 of the light emitting unit Cell_2 will partially cover the light sensors 25_5 and 25_6. The light-emitting element 80 of the light-emitting unit Cell_1 will provide light 90 to illuminate the finger 40 and generate reflected light 95, and the reflected light 95 from the finger 40 will reach through the light-transmitting area Z2 of the light-emitting unit Cell_1 and the plural collimator 35 below Light sensor 25_2-25_5. In addition, the light-emitting element 80 of the light-emitting unit Cell_2 will provide light 90 to illuminate the finger 40 and generate reflected light 95, and the reflected light 95 from the finger 40 will pass through the light-transmitting area Z2 of the light-emitting unit Cell_2 and the complex collimator 35 below it. And reach the light sensor 25_6-25_8. Since each light sensor 25 corresponds to a plurality of collimators 35, when a part of the collimators 35 on the light sensor 25 is covered by the light source region Z1 of the light emitting unit Cell located above, the light sensor The detector 25 can receive the reflected light 95 through other collimators 35 that are not covered. Therefore, according to the sensing output provided by each light sensor 25, the optical fingerprint sensor 200A can obtain the complete fingerprint information of the finger 40.

FIG. 6 shows an optical fingerprint sensor 200B according to some embodiments of the present invention. The optical fingerprint sensor 200B includes a sensing module 10C and a panel module 50C. The sensing module 10C is disposed below the panel module 50C. The optical fingerprint sensor 200B is formed by combining the sensing module 10C and the panel module 50C. In this embodiment, the sensing module 10C is coupled to the panel module 50C via an adhesive (not shown). In this embodiment, the number of light sensors 25 (for example, light sensors 25_1-25_8) included in the light sensing layer 20 is approximately the number of light emitting cells (for example, light emitting cells Cell_1) included in the light emitting layer 70. -Cell_2), and the pitch L34 of the light-emitting cell Cell is about four times the pitch L12 of the light sensor 25. In the panel module 50C of the optical fingerprint sensor 200B, the length of the light source region Z1 of the light-emitting unit Cell is approximately equal to the length of the two light sensors 25. In the optical fingerprint sensor 200B of FIG. 6, two out of every four adjacent light sensors 25 are almost completely occupied by the light source zone Z1 of the light emitting unit Cell above. cover.

In addition, due to the difference in the aperture or pitch of the collimator in the filter layer, or the difference in the positional relationship between the collimator in the filter layer and the light sensor in the light sensing layer, it will cause almost complete The two light sensors 25 covered by the light source region Z1 of the light emitting unit Cell above the ground cannot receive the reflected light because the collimator above is completely covered by the light source region Z1 of the light emitting unit Cell. For example, similar to the optical fingerprint sensor 200A of FIG. 5, in the optical fingerprint sensor 200B of FIG. 6, the light source region Z1 of the light emitting unit Cell_2 will almost completely cover the light sensors 25_5 and 25_6 and emit light. The light source zone Z1 of the cell Cell_1 will also cover the light sensors 25_1 and 25_2 almost completely. However, unlike the optical fingerprint sensor 200A of FIG. 5, in the optical fingerprint sensor 200B of FIG. 6, since the photo sensors 25_5 and 25_6 and the collimators above the photo sensors 25_1 and 25_2 are respectively It is completely covered by the light source area Z1 of the light emitting unit Cell_2 and the light source area Z1 of the light emitting unit Cell_1, so that the light sensors 25_5 and 25_6 and the light sensors 25_1 and 25_2 cannot receive the reflected light 95.

As shown in FIG. 6, the light-emitting element 80 of the light-emitting unit Cell_1 will provide the light 90 to irradiate the finger 40 and generate a reflected light 95, and the reflected light 95 from the finger 40 will pass through the light-transmitting area Z2 of the light-emitting unit Cell_1 and the area below it. The collimator 35 reaches the light sensors 25_3 and 25_4. In addition, the light-emitting element 80 of the light-emitting unit Cell_2 will provide light 90 to illuminate the finger 40 and generate reflected light 95, and the reflected light 95 from the finger 40 will pass through the light-transmitting area Z2 of the light-emitting unit Cell_2 and the complex collimator 35 below And reach the light sensors 25_7 and 25_8. Since two of the four light sensors 25 are almost completely covered by the light source zone Z1 of the light emitting unit Cell above, the collimator 35 above it is completely covered and cannot receive reflections. Light 95, so the processor does not need to read the sensing output of each light sensor, but only needs to read the sensing output of two light sensors in four adjacent light sensors The fingerprint information of the finger 40 is obtained, so that the calculation amount and the processing speed can be reduced, and the power consumption of the optical fingerprint sensor 200B can be reduced.

FIG. 7 shows an optical fingerprint sensor 200C according to some embodiments of the present invention. The optical fingerprint sensor 200C includes a sensing module 10D and a panel module 50D. The sensing module 10D is disposed below the panel module 50D. The optical fingerprint sensor 200C is formed by combining the sensing module 10D and the panel module 50D. In this embodiment, the sensing module 10D is coupled to the panel module 50D via an adhesive (not shown). In this embodiment, the number of light sensors 25 (for example, light sensors 25_1-25_8) included in the light sensing layer 20 is approximately the number of light emitting cells (for example, light emitting cells Cell_1) included in the light emitting layer 70. -Cell_2), and the pitch L34 of the light-emitting cell Cell is about four times the pitch L12 of the light sensor 25. Compared with the panel module 50C of the optical fingerprint sensor 200B of FIG. 6, the position relationship between the light sensor in the light sensing layer and the light emitting unit Cell in the light emitting layer is different. In the panel module 50D of the fingerprint sensor 200C, the light source zone Z1 of each light-emitting unit Cell completely covers one light sensor 25 and partially covers the other two light sensors 25. For example, the length of the light source region Z1 of the light emitting unit Cell is approximately the length of the two light sensors 25. In the optical fingerprint sensor 200C of FIG. 7, one of each of the four adjacent light sensors 25 is completely covered by the light source region Z1 of the light emitting unit Cell above. For example, the light source area Z1 of the light emitting unit Cell_2 will completely cover the light sensor 25_6, and the light source area Z1 of the light emitting unit Cell_1 will completely cover the light sensor 25_2. In addition, the light source area Z1 of the light emitting unit Cell_2 will partially cover the light sensors 25_5 and 25_7, and the light source area Z1 of the light emitting unit Cell_1 will partially cover the light sensors 25_1 and 25_3. The light-emitting element 80 of the light-emitting unit Cell_2 will provide light 90 to illuminate the finger 40 and generate reflected light 95, and the reflected light 95 from the finger 40 will reach the light through the light-transmitting area Z2 of the light-emitting unit Cell_1 and the collimator 35 below it Sensor 25_3-25_5. In addition, the reflected light 95 from the finger 40 also reaches the light sensors 25_7 and 25_8 through the light-transmitting area Z2 of the light-emitting unit Cell_2 and the plurality of collimators 35 below it. Since one out of every four light sensors 25 is completely covered by the light source zone Z1 of the light emitting unit Cell above, the processor does not need to read the sensing output of each light sensor. The fingerprint information of the finger 40 can be obtained only by reading the sensing output of three light sensors among four adjacent light sensors, thereby reducing the amount of calculation and speeding up the processing, and reducing the optical fingerprint. Power consumption of the sensor 200C.

In some embodiments, the length of the light sensor 25 of the optical fingerprint sensors 200A, 200B, and 200C is 21 micrometers (for example, L1 = 21), and the interval between two adjacent light sensors 25_1 and 25_2 is 1 micron (for example, L2 = 1). In addition, the pitch L34 of the light-emitting unit Cell is 80 micrometers, and the lengths of the light source region Z1 and the light-transmitting region Z2 are each about 40 micrometers. In addition, the aperture of the collimator 35 can be determined according to the actual application. In some embodiments, the aperture L5 of the collimator 35 is between 1-20 micrometers (μm). In addition, the ratio of the aperture L5 to the height H1 of the collimator is between 1: 3 and 1:20. The aperture L5 is smaller than the length L4 of the light-transmitting region Z2. In the optical fingerprint sensors 200A, 200B, and 200C, the number of the light sensors 25 included in the light sensing layer 20 (for example, the light sensors 25_1-25_8) is about the light emitting unit Cell included in the light emitting layer 70. The number of light emitting cells (for example, Cell_1-Cell_2) is four times, and the pitch L34 of the light emitting cell Cell is about four times the pitch L12 of the light sensor 25. As described previously, the light sensor 25 of the sensing module 10B / 10C / 10D and the light emitting unit Cell of the panel module 50B / 50C / 50D need not be aligned. Therefore, the manufacturing process of the optical fingerprint sensors 200A, 200B, and 200C can be simplified and the yield can be improved.

In the optical fingerprint sensor in the embodiment of the present invention, since each light sensor corresponds to a plurality of collimators, it is not necessary to consider the light sensor and the collimator in the process of manufacturing the sensing module. Straightener positional relationship. In addition, since the number of light sensors is more than that of the light-emitting units, it is not necessary to consider the positional relationship between the sensing module and the panel module when combining the sensing module with the panel module. That is, there is no need to align the light sensor with the collimator, and there is no need to align the light sensor with the light emitting unit. Therefore, the manufacturing process of the optical fingerprint sensor can be simplified. In addition, the optical fingerprint sensor can obtain the fingerprint information of the finger according to the sensing output of some light sensors in the sensing module, so it can reduce the calculation amount and speed up the processing speed, and reduce the power consumption of the optical fingerprint sensor. the amount.

Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art including ordinary knowledge can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the appended patent application.

Claims (19)

An optical fingerprint sensor includes: a panel module including: a cover glass; and a light-emitting layer disposed under the cover glass and including a plurality of light-emitting units, wherein each of the light-emitting units includes: a light source region, wherein A light emitting element is disposed in the light source area to provide light to the cover glass; and a light transmitting area; and a sensing module including: a light sensing layer including a plurality of light sensors arranged in an array; and A filter layer is disposed between the light sensing layer and the light emitting layer of the panel module, and includes a plurality of collimators arranged in a specific pattern, wherein the number of the collimators is greater than the light sensors. The number of sensors and the number of the light sensors are greater than the number of the light-emitting units. The distance between the light-emitting units is approximately twice the distance between the light sensors. At least one of the isooptic sensors will receive the reflected light of the light shining on a finger of a user placed above the cover glass through the light-transmitting area of the light-emitting unit and the collimators. The optical fingerprint sensor according to item 1 of the scope of patent application, wherein the number of the light sensors is approximately twice the number of the light emitting units. The optical fingerprint sensor according to item 1 of the patent application scope, wherein the panel module is coupled to the sensing module via an adhesive. The optical fingerprint sensor according to item 1 of the patent application range, wherein the light-transmitting region of the light-emitting unit is disposed between the corresponding light-source region and the light-source region of the adjacent light-emitting unit. The optical fingerprint sensor according to item 4 of the scope of patent application, wherein in the light emitting unit, the length of the light source region is approximately the same as the length of the light transmitting region. The optical fingerprint sensor according to item 1 of the patent application scope, wherein the light emitting element is an organic light emitting diode. The optical fingerprint sensor according to item 1 of the scope of the patent application, wherein the light source area covers one of two adjacent light sensors almost completely, or partially covers two adjacent light sensors. Each of these light sensors. The optical fingerprint sensor according to item 1 of the patent application scope, wherein the collimators are arranged in the filter layer in an array manner or a staggered manner. The optical fingerprint sensor according to item 1 of the patent application range, wherein the aperture to height ratio of the collimator is between 1: 3 and 1:20, and the aperture of the collimator is between 1-20 Between micrometers. An optical fingerprint sensor includes: a panel module including: a cover glass; and a light-emitting layer disposed under the cover glass and including a plurality of light-emitting units, wherein each of the light-emitting units includes: a light source region, wherein A light emitting element is disposed in the light source area to provide light to the cover glass; and a light transmitting area; and a sensing module including: a light sensing layer including a plurality of light sensors arranged in an array; and A filter layer is disposed between the light sensing layer and the light emitting layer of the panel module, and includes a plurality of collimators arranged in a specific pattern, wherein the number of the collimators is greater than the light sensors. The number of sensors and the number of the light sensors are greater than the number of the light emitting units. The distance between the light emitting units is approximately four times the distance between the light sensors. At least two of the light sensors will receive the reflected light of the light shining on a finger of a user placed above the cover glass through the light-transmitting area of the light-emitting unit and the collimator. According to the optical fingerprint sensor described in item 10 of the patent application scope, the number of the light sensors is approximately four times the number of the light emitting units. The optical fingerprint sensor according to item 10 of the patent application scope, wherein the panel module is coupled to the sensing module via an adhesive. The optical fingerprint sensor according to item 10 of the scope of patent application, wherein the light-transmitting region of the light-emitting unit is disposed between the corresponding light-source region and the light-source region of the adjacent light-emitting unit. The optical fingerprint sensor according to item 13 of the application, wherein in the light emitting unit, the length of the light source region is approximately the same as the length of the light transmitting region. The optical fingerprint sensor according to item 10 of the application, wherein the light-emitting element is an organic light-emitting element. The optical fingerprint sensor according to item 10 of the patent application scope, wherein the light source area completely covers one of the four consecutive adjacent light sensors. The optical fingerprint sensor according to item 10 of the patent application scope, wherein the collimators are arranged in the filter layer in an array manner or a staggered manner. The optical fingerprint sensor according to item 10 of the patent application, wherein the diameter-to-height ratio of the collimator is between 1: 3 and 1:20, and the diameter of the collimator is between 1-20 Between micrometers. An optical fingerprint sensor includes: a panel module including: a cover glass; and a light-emitting layer disposed under the cover glass and including a plurality of light-emitting units, wherein each of the light-emitting units includes: a light source region, wherein A light emitting element is disposed in the light source area to provide light to the cover glass; and a light transmitting area; and a sensing module including: a light sensing layer including a plurality of light sensors arranged in an array; and A filter layer is disposed between the light sensing layer and the light emitting layer of the panel module, and includes a plurality of collimators arranged in a specific pattern, wherein the number of the collimators is greater than the light sensors. The number of light sensors and the number of the light sensors are greater than the number of the light emitting units. Some of the light sensors will be received through the light transmitting area of the light emitting units and some of the collimators. The reflected light from the light hitting a user's finger placed above the cover glass, and some of the light sensors and some of the collimators will be completely used by the light of the light emitting units. The light-transmitting area of the light-emitting unit is disposed between the corresponding light-source area and the light-emitting area of the adjacent light-emitting unit. In the light-emitting unit, the length of the light-emitting area is approximately the same. The length of the light-transmitting area.