CN108629253B - Fingerprint identification device - Google Patents
Fingerprint identification device Download PDFInfo
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- CN108629253B CN108629253B CN201710183302.0A CN201710183302A CN108629253B CN 108629253 B CN108629253 B CN 108629253B CN 201710183302 A CN201710183302 A CN 201710183302A CN 108629253 B CN108629253 B CN 108629253B
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- light
- refraction
- image sensing
- sensing chip
- collimating
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1341—Sensing with light passing through the finger
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- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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- Theoretical Computer Science (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention discloses a fingerprint identification device, which comprises a cover plate, an image sensing chip, a light guide part, at least one light emitting part, a collimating part and a light folding part. The image sensing chip is positioned on one side of the cover plate; the light guide piece covers the image sensing chip and comprises a light inlet surface and a light outlet surface, and the light outlet surface is provided with a microstructure; the light emitting element is arranged adjacent to the light incident surface. The collimating component is positioned between the light-emitting surface and the image sensing chip, and the refraction component is positioned between the collimating component and the image sensing chip and comprises a plurality of refraction structures; the outer diameter of the refraction structure is gradually reduced to form sharp angles with the distance from the collimation piece, and the angles of the sharp angles are gradually increased with the distance from the central line of the refraction piece.
Description
Technical Field
The present invention relates to a device for reading or recognizing a pattern, and more particularly, to a fingerprint recognition device.
Background
Fingerprint identification technology is widely applied to various electronic devices to prevent the electronic devices from being stolen because of having good anti-theft and personal privacy protection functions.
In the past, the size of the image sensing chip in the fingerprint identification device was determined mainly by the size of the sensed area. More specifically, the smaller the sensed area, the smaller the size of the image sensing chip; on the contrary, the larger the sensed area is, the larger the size of the image sensing chip is, and the size of the image sensing chip is the same as that of the sensed area, thereby improving the resolution capability of the image sensing chip. However, the large-sized image sensor chip has disadvantages of high cost and large volume.
Disclosure of Invention
The present invention is directed to a fingerprint identification device, which can reduce the size of an image sensor chip to reduce the cost.
The invention provides a fingerprint identification device, which is provided with a finger sensing area and comprises a cover plate, an image sensing chip, a light guide piece, at least one luminous piece, a collimating piece and a light folding piece. The image sensing chip is positioned on one side of the cover plate; the light guide piece covers the image sensing chip and comprises a light inlet surface and a light outlet surface, and the light outlet surface is provided with a microstructure; the light emitting element is arranged adjacent to the light incident surface. The collimating component is positioned between the light-emitting surface and the image sensing chip, and the refraction component is positioned between the collimating component and the image sensing chip and comprises a plurality of refraction structures; the outer diameter of the refraction structure is gradually reduced to form a sharp angle along with the distance from the collimation piece, and the angle of the sharp angle of the refraction structure is gradually increased along with the distance from the central line of the refraction piece.
In an embodiment of the present invention, the image sensor chip includes a plurality of sensor pixels, and when a length of the image sensor chip in a cross section formed by optical axes of the sensor pixels is a and a length of the finger sensing area in the cross section is b, the following condition is satisfied: b is more than or equal to 2 a.
In an embodiment of the invention, the number of the sensing pixels is the same as the number of the refraction structures
In an embodiment of the invention, the number of the sensing pixels is smaller than the number of the refraction structures.
In an embodiment of the present invention, the fingerprint identification device further includes a plurality of microlenses, and the microlenses are respectively disposed on the sensing pixels.
In an embodiment of the present invention, the collimating member includes a plurality of light-shielding portions and a plurality of light-transmitting portions, the light-shielding portions and the light-transmitting portions are arranged in a staggered manner, and the light-transmitting portions are disposed corresponding to the refraction structures.
In an embodiment of the present invention, the refraction element further includes a base, the refraction structure is disposed on the base, and an outer diameter of the refraction structure tapers to form a sharp angle with distance from the base.
In an embodiment of the present invention, the outer surface of the refractive structure is a plane or a curved surface.
In an embodiment of the present invention, the fingerprint identification device further includes a light shaping element disposed between the light-emitting surface and the collimating element.
In an embodiment of the present invention, the fingerprint identification device further includes a first adhesive member and a second adhesive member, the first adhesive member is disposed between the cover plate and the light-emitting surface, and the second adhesive member is disposed between the light-emitting surface and the collimating member.
The invention turns the angle of the reflected light beam generated in the finger sensing area by the refraction structure of the refraction piece, so that the size of the image sensing chip can be reduced, and the effect of reducing the cost is achieved.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
FIG. 1 is a schematic top view of a digital electronic device according to a first embodiment of the invention;
FIG. 2 is a cross-sectional view of a fingerprint identification device according to a first embodiment of the present invention;
FIG. 3 is a cross-sectional view of a collimating element and a refracting element according to a first embodiment of the present invention;
FIG. 4 is a sectional view of a fingerprint identification device according to a second embodiment of the present invention; and
FIG. 5 is a cross-sectional view of a collimating element and a refracting element according to a second embodiment of the present invention.
Reference numerals
1 digital electronic device
10 casing
11 Screen
12 fingerprint identification device
123 finger sensing area
124 substrate
1240 upper surface
126 cover plate
1260 internal surface
1262 outer surface
128 image sensing chip
1280 sensing pixel
1282 electrode
130 luminous element
132 light guide
1320 incident part
1321 light incident surface
1322 light guiding part
1323 light emitting surface
1324 micro structure
1326 groove
133 accommodation space
134 collimating element
1340 light shielding part
1342 light-transmitting part
136 dioptric element
1360 base
1362 refractive structure
137 conducting wire
138 finishing profile
139 adhesive
140 first adhesive member
142 second adhesion part
144 microlens
C center line
I optical axis
Detailed Description
Referring to fig. 1, a top view of a digital electronic device according to a first embodiment of the invention is shown. The digital electronic device 1 may be a smart phone, a tablet computer, a personal digital assistant, a media player, and other stationary and portable electronic devices; the digital electronic device 1 comprises a shell 10, a screen 11 and a fingerprint identification device 12; the screen 11 and the fingerprint identification device 12 are respectively exposed out of the housing 10, and the screen 11 is used for displaying information to a user to watch and for the user to operate in a touch manner; the fingerprint identification device 12 is used for performing a fingerprint authentication function on the identity of the user, so as to increase the use security of the digital electronic device 1.
Referring to fig. 2, a cross-sectional view of the fingerprint identification device according to the first embodiment of the invention is shown, the cross-sectional view being taken along the line 2 shown in fig. 1. The fingerprint identification device 12 has a finger sensing area 123, and the size of the finger sensing area 123 can be set to capture the fingerprint of a single finger. In fig. 2, the fingerprint identification device 12 includes a cover plate 126, an image sensor chip 128, at least one light emitting element 130, a light guide 132, a collimating element 134 and a light folding element 136, which cooperate to pick up fingerprint information of a user and authenticate the fingerprint information.
The cover 126 has an inner surface 1260 and an outer surface 1262, the inner surface 1260 is opposite to the outer surface 1262, and the outer surface 1262 is a touch operation surface of the fingerprint identification device 12; in other words, the user touches the outer surface 1262 of the cover plate 126 with his finger to perform fingerprint pickup and authentication. The cover plate 126 may be a substrate (e.g., a glass substrate) with high mechanical strength and high transmittance, the high mechanical strength is mainly used to prevent the elements under the cover plate 126 from being damaged by pressing with fingers or other external impacts, and the high transmittance is used to prevent the light beam from the light emitting element 130 from being shielded.
The image sensing chip 128 is disposed on one side of the cover plate 126 and adapted to receive fingerprint information generated by the light beam reflected by the finger in the finger sensing area 123 and authenticate the fingerprint information. The image sensor chip 128 may be mounted on the upper surface 1240 of the substrate 124 and electrically connected to the circuit traces (not shown) on the substrate 124 through the wires 137 connected across the electrodes 1282 (shown in fig. 3) of the image sensor chip 128 and the upper surface 1240; the fingerprint information authentication result may be transmitted to the screen 11 through circuit wiring formed on the substrate 124 to be displayed. The image sensor chip 128 may include a Charge-Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) Device.
As shown in fig. 1, the image sensor chip 128 may have a rectangular shape and may include a plurality of sensor pixels 1280 (shown in fig. 3) spaced apart from each other and arranged in an array; wherein the sensing pixel 1280 is adapted to receive the light beam reflected by the finger and generate fingerprint information.
Each sensing pixel 1280 has an optical axis I, and the optical axes I of all the sensing pixels 1280 are arranged on a cross section (e.g., a section taken along line 2 shown in fig. 1); when the length of the image sensing chip 128 on the cross section is a and the length of the finger sensing area 123 on the cross section is b, the following conditions are satisfied:
b≥2a。
the light emitting element 130 is disposed on the upper surface 1240 of the substrate 124 and beside the image sensor chip 128. Fig. 2 schematically illustrates two light emitting elements 130, and the two light emitting elements 130 are respectively disposed at the left and right sides of the image sensor chip 128; in practical implementation, the number of the light emitting elements 130 and the relative arrangement relationship between the light emitting elements 130 and the image sensing chip 128 are not limited to those shown in fig. 2, and the fingerprint identification device 1 includes a plurality of light emitting elements 130, and the light emitting elements 130 may be disposed at equal angles beside the image sensing chip 128, for example. The light emitting element 130 is adapted to emit light beams toward a light incident surface 1321 of the light guiding element 132. The light emitting element 130 may be, for example, a light emitting diode, and is configured to generate a non-visible light beam (e.g., an infrared light beam).
The light guide member 132 is transparent, and is disposed between the substrate 124 and the cover plate 126 and covers the image sensor chip 128; the light guide 132 not only guides the light beam generated by the light emitting element 130 to the finger sensing region 123, but also guides the light beam reflected by the finger (hereinafter referred to as reflected light), so that the reflected light beam can be transmitted to the image sensing chip 128 through the collimating element 134 and the refracting element 136.
In fig. 2, the light guide member 132 is made of a material with high transmittance, and includes a light incident portion 1320, a light guide portion 1322, and a plurality of microstructures 1324. The light incident portion 1320 may have a ring shape, one end of which is connected to the light guide portion 1322, and the other end of which is disposed on the upper surface 1240 of the substrate 124. As shown in fig. 2, the light incident surface 1321 of the light incident portion 1320 may have a plurality of grooves 1326 recessed toward the light guide portion 1322 for accommodating the light emitting element 130 therein, so as to increase the probability that the light beam emitted by the light emitting element 130 enters the light incident portion 1320. The number of the grooves 1326 is the same as the number of the light emitting members 130. The light incident portion 1320 is disposed on the substrate 124 for supporting the light guide portion 1322 on the substrate 124 with a certain distance, and the image sensor chip 128, the collimating element 134 and the light refracting element 136 are respectively disposed in an accommodating space 133 defined by the substrate 124, the light incident portion 1320 and the light guide portion 1322.
Further, the outer diameter of the light incident portion 1320 is gradually reduced from the substrate 124 to the cover plate 126, so that the side cross-sectional view of the light guide member 132 is substantially trapezoidal; therefore, the light beam emitted by the light emitting element 130 can be transmitted to the finger sensing area 123. In the present invention, the light incident portion 1320 and the light guide portion 1322 may be integrally formed; the top surface of the light guide 1322 can be attached to the inner surface 1260 of the cover plate 126 by a first adhesive member 140. The first adhesion member 140 is transparent, and the refractive index thereof can be, for example, the same as that of the cover plate 126.
The light guide 132 further includes a light emitting surface 1323, which is a surface of the light guide 1322 away from the cover plate 126; in the present embodiment, the normal direction of the light emitting surface 1323 is parallel to the normal direction of the light incident surface 1321. The microstructures 1324 are disposed on the light emitting surface 1323, and the microstructures 1324 and the light guide portion 1322 may be integrally formed. As shown in fig. 2, the microstructures 1324 may be a saw-tooth structure that is recessed from the light emitting surface 1323 into the light guiding portion 1322; in practical implementation, the micro-structure 1324 does not exclude a saw-tooth structure, a columnar structure or a prism structure, which may protrude from the light emitting surface 1323.
The light emitting member 130 and the light guide member 132 cooperate to generate a light beam transmitted to the finger sensing region 132; the light beam generated by the light emitting element 130 mainly enters the light incident portion 1320 through the light incident surface 1321, and then is transmitted to the light guiding portion 1322; the light ray propagation path entering the light guide part 1322 has two paths: one is directly refracted by the light guide portion 1322 and then transmitted to the user's finger located in the finger sensing area 123 through the cover plate 126, and the other is transmitted back and forth in the light guide portion 1322 in the total internal reflection manner until the microstructure 1324 makes the propagation angle of the light beam smaller than the critical angle of the total internal reflection, so that the light beam is transmitted to the user's finger located in the finger sensing area 123 through the cover plate 126. In other words, the microstructures 1324 are used to suppress the light beam from continuously propagating in the light guiding portion 1322 by total internal reflection. The light beam reflected by the finger (i.e. the reflected light beam) exits from the light-exiting surface 123 and is transmitted to the image sensor chip 128 through the collimating element 134 and the refracting element 136 in sequence.
The collimating element 134 is located between the light emitting surface 1323 of the light guide 132 and the image sensor chip 128, and can be attached to the light guide 132 by a second adhesive element 142. The length of the finger sensing area 123 may be approximately the same as the length of the collimating element 134. The collimating element 134 can just touch the bottom of the microstructure 1324, so as to avoid the problem that the reflected light beam is directly transmitted to the substrate 124 (i.e. not transmitted to the substrate 124 through the collimating element 134 and the light refracting element 136) after passing through the light guiding portion 1322, which causes poor contrast and image quality of the image sensor chip 128. In addition, when the second adhesion element 142 is attached to the micro structures 1324, in addition to preventing the micro structures 1324 from inhibiting the light beam from being transmitted in the light guide portion 1322 by total internal reflection, a portion of the light beam that is not reflected by the finger may be refracted downward and transmitted to the image sensing chip 128, so that the image sensing chip 128 generates false fingerprint information. Therefore, during assembly, the second adhesive 142 for fixing the collimating element 134 on the light guide 132 should be prevented from adhering to the microstructures 1324; in fig. 2, the second adhesive 1324 is disposed at a position of the light incident portion 1320 adjacent to the light emitting surface 1323. The second adhesive 142 may be, for example, a photo-curable adhesive (e.g., an ultraviolet light-curable adhesive).
The collimating element 134 is used for limiting the transmission of the reflected light beam emitted from the light emitting surface 1323 to the light incident area of the refracting element 136. Referring to fig. 3, the collimating member 134 includes a plurality of light shielding portions 1340 and a plurality of light-transmitting portions 1342, wherein the light-transmitting portions 1342 are arranged between two adjacent light shielding portions 1340; in other words, the light shielding portions 1340 and the light transmitting portions 1342 are alternately arranged.
In the reflected light beam, those incident at a large angle are blocked by the light blocking portions 1340 arranged at both sides of the light-transmitting portion 1342 and cannot be transmitted to the refractor 136, while those incident at a small angle can be directly transmitted to the refractor 136 through the light-transmitting portion 1342. Here, the light beam passing through the collimating element 134 is defined as a collimated light beam. In addition, the number of light-transmitting portions 1342 is designed to be the same as the number of sensing pixels 1280, i.e., collimated light beams passing through a single light-transmitting portion 1342 are used by a single sensing pixel 1280 to generate fingerprint information; further, by adjusting the length L of the collimating element 134 and the aperture ψ of the light transmitting portion 1342, the light incident area of the collimating element 136 can be adjusted.
The light-folding member 136 is disposed between the collimating member 134 and the image sensor chip 128 and is spaced above the image sensor chip 128. The light-folding member 136 receives the collimated light beam and is used for converging the collimated light beam passing through the light-transmitting portion 1342 to the sensing pixel 1280 of the image sensing chip 128. The thickness T of the light-folding member 136 may be 50-200 μm.
In fig. 3, the light refraction element 136 includes a base 1360 and a plurality of refraction structures 1362; the base 1360 is a light-transmitting sheet that can be attached to the collimating element 134 by an adhesive 139 and can be made of, for example, a polymer material such as polyethylene terephthalate (PET). The refractive structure 1362 is disposed on the substrate 1360 and has an outer diameter tapering to a sharp angle as it moves away from the base 1360; the refractive structure 1362 may be fabricated, for example, from a light-curable glue. The outer surface of the refractive structure 1362 is a plane.
The number of the refraction structures 1362 is the same as the number of the sensing pixels 1280, and the angle of the sharp corner of the refraction structure 136 gradually increases with the distance from the center line C of the refraction member 136, so that the collimated light beam far from the center line C of the refraction member 136 is bent by a large angle and then converged at the corresponding sensing pixel 1280, and the collimated light beam close to the center line C of the refraction member 136 is bent by a small angle and then converged at the corresponding sensing pixel 1280.
In summary, in the fingerprint identification device of the present invention, the light beam generated by the light emitting element 130 enters the light guiding element 132 through the light incident surface 1321 and is transmitted to the finger sensing area 123; the reflected light beam generated by the light reflected by the finger of the user sequentially passes through the light emitting surface 1323, the collimating element 134 and the refracting element 136 to be focused on the sensing pixel 1280 of the image sensing chip 128. In the invention, the angle at which the collimated light beam passing through the collimating component 134 is incident on the sensing pixel 1280 can be changed by the refraction structure 1362 on the refraction component 136, so as to achieve the effect of reducing the length of the image sensing chip 128.
Referring to fig. 4, a cross-sectional view of a fingerprint identification device according to a second embodiment of the invention is shown. The fingerprint identification device 12 shown in fig. 4 is applied to the digital electronic device 1 shown in fig. 1 to perform a fingerprint authentication function on the identity of a user, so as to achieve the effect of increasing the use security of the digital electronic device 1.
The fingerprint recognition device 12 is disposed on an upper surface 1240 of a substrate 124 and is used for picking up fingerprint information and authenticating the fingerprint information. The fingerprint identification device 12 includes a cover plate 126, an image sensor chip 128, a plurality of light emitting members 130, a light guide member 132, a collimating member 134, and a light folding member 136.
An outer surface 1262 of the cover 126 is a touch control surface of the fingerprint recognition device 12; the user touches the outer surface 1262 with his or her finger to perform fingerprint pickup and authentication.
The image sensor chip 128 is disposed on one side of the cover plate 126 and is adapted to receive a light beam (hereinafter referred to as a reflected light beam) reflected by a finger in a finger sensing area 123 to generate fingerprint information and perform authentication. The image sensor chip 128 is mounted on an upper surface 1240 of the substrate 124.
The image sensor chip 128 is rectangular (as shown in fig. 1), and may include thereon a plurality of sensor pixels 1280 arranged in an array spaced apart from each other, as shown in fig. 5; the sensing pixels 1280 are adapted to receive the light beams reflected by the fingerprint and generate fingerprint information. Each sensing pixel 1280 has an optical axis I, and the optical axes I of all the sensing pixels 1280 are arranged on a cross section (e.g., a section taken along line 2 shown in fig. 1); when the length of the image sensor chip 128 in the cross section is a and the length of the finger sensing area 123 in the cross section is b, the following conditions are satisfied:
b≥2a。
The light emitting element 130 is disposed on the substrate 124 and beside the image sensor chip 128, and is adapted to emit a non-visible light beam toward a light incident surface 1321 of the light guide 132.
The light guide member 132 is transparent, and is disposed between the substrate 124 and the cover plate 126 and covers the image sensor chip 128; the light guide member 132 includes a light incident portion 1320, a light guide portion 1322, and a plurality of microstructures 1324. The light incident portion 1320 is annular, and the outer diameter thereof gradually decreases from the substrate 124 to the cover plate 126, so as to transmit the light beam emitted from the light emitting element 130 to the finger sensing area 123. One end of the light incident portion 1320 is connected to the light guide portion 1322, and the other end is disposed on the upper surface 1240 of the substrate 124 and includes a light incident surface 1321; a plurality of grooves 1326 may be formed in the light incident surface 1321 for accommodating the light emitting element 130 therein, so that the light beam generated by the light emitting element 130 is transmitted to the light guide portion 1322. The substrate 124, the light incident portion 1320 and the light guide portion 1322 cooperate to define an accommodating space 133 for accommodating the image sensor chip 128, the collimating element 134 and the refractive element 136 therein. The top surface of the light guide 1322 can be attached to an inner surface 1260 of the cover plate 126 by a first adhesive member 140.
The microstructures 1324 are formed on the light emitting surface 1323, and are used for inhibiting the light beam transmitted to the light guide portion 1322 from the light incident portion 1320 from being continuously transmitted in the light guide portion 1322 in a total internal reflection manner; the micro-structure 1324 may be a saw-tooth structure recessed into the light emitting surface 1323.
The light emitting element 130 and the light guide element 132 cooperate to generate a light beam transmitted to the finger sensing area 132; the light beam generated by the light emitting element 130 enters the light guiding portion 1322 through the light incident surface 1321, wherein the light traveling path entering the light guiding portion 1322 has two paths: one is directly transmitted to the user's finger through the cover plate 126 after being refracted by the light guide portion 1322, and the other is transmitted back and forth within the light guide portion 1322 by total internal reflection until the microstructure 1324 makes the propagation angle of the light beam smaller than the critical angle of total internal reflection, and the light beam is transmitted to the user's finger through the cover plate 126. The light beam reflected by the finger (i.e. the reflected light beam) exits from the light-exiting surface 123 and is transmitted to the image sensor chip 128 through the collimating element 134 and the refracting element 136 in sequence.
It is noted that the angle of the microstructure 1324 illustrated in fig. 5 is smaller than the angle of the microstructure 1324 illustrated in fig. 2, which can be used to allow the reflected light beam with a large angle to enter the collimating element 134.
The collimating member 134 is located between the light emitting surface 1323 of the light guiding member 132 and the image sensing chip 128, and can be attached to the light guiding member 132 by a second adhesive member 142; the second adhesive 142 is disposed between the collimating element 134 and the micro-structure 1324 of the light guide 132, and the second adhesive 142 can be, for example, a photo-curing adhesive.
The collimating element 134 is used for limiting the transmission of the reflected light beam to the light incident surface of the refracting element 136, and may include a plurality of light shielding portions 1340 and a plurality of light transmitting portions 1342 (as shown in fig. 5) arranged in a staggered manner. The light shielding portion 1340 prevents the reflected light beam incident at a large angle from being transmitted to the refraction member 136, and the light transmitting portion 1342 allows the reflected light beam incident at a small angle to be transmitted to the refraction member 136. Here, the light beam passing through the collimating element 134 is defined as a collimated light beam.
The light folding member 136 is located between the collimating member 134 and the image sensor chip 128, and is located above the image sensor chip 128 with a space; the light-folding element 136 receives the collimated light beam and converges the collimated light beam to each sensing pixel 1280 of the image sensor chip 128.
The light-folding member 136 includes a base 1360 and a plurality of refraction structures 1362; the base 1360 is a light transmissive sheet that may be attached to the bottom of the collimating elements 134 by adhesive 139. Refractive structure 1362 is disposed on substrate 1360 and has an outer diameter that tapers away from base 1360 to a sharp angle. In fig. 5, the outer surface of the refractive structure 1362 is a curved surface; the curved surface design can further enlarge the turning angle of the alignment straight beam.
The number of the refraction structures 1362 is the same as the number of the light-transmitting portions 1342, and the refraction structures 1362 are disposed corresponding to the light-transmitting portions 1342 to receive the collimated light beams passing through the light-transmitting portions 1342. The angle of the sharp corner of the refraction structure 136 gradually increases with the distance from the center line C of the refraction member 136, so that the collimated light beam far from the center line C of the refraction member 136 is bent by a large angle and then converged at the sensing pixel 1280, and the collimated light beam close to the center line C of the refraction member 136 is bent by a small angle and then converged at the sensing pixel 1280, thereby achieving the effect of reducing the length of the image sensor chip 128. In this embodiment, the number of sensing pixels 1280 is less than the number of refractive structures 1362; in other words, a single sensing pixel 1280 may receive light beams from multiple refractive structures 1362. For example, in FIG. 5, each sensing pixel 1280 can receive light beams from three refractive structures 1362 and generate fingerprint information for authentication.
In addition, the fingerprint recognition device 12 may further include a light-shaping member 138 and a plurality of micro-lenses 144; the light shaping member 138 is disposed between the second adhesion member 142 and the collimating member 134 for shaping the reflected light beam entering the collimating member 134, for example, the reflected light beam entering the light shaping member 138 at a large angle is emitted to the collimating member 134 at a small angle. The micro-lens 144 is disposed on each of the sensing pixels 1280, and is used for further focusing the light beam passing through the light-folding member 136 on the sensing pixels 1280 to improve the sensing effect.
In summary, in the fingerprint identification device of the present invention, the light beam generated by the light emitting element 130 enters the light guiding element 132 through the light incident surface 1321 and is transmitted to the finger sensing area 123; the reflected light beam generated by the light reflected by the finger of the user sequentially passes through the light emitting surface 1323, the light shaping element 138, the collimating element 134 and the refraction element 136 to be focused on the sensing pixel 1280 of the image sensing chip 128. The refraction structure 1362 on the refraction member 136 of the present invention can change the angle of the collimated light beam passing through the collimation member 134 and entering the sensing pixel 1280, thereby achieving the effect of reducing the length of the image sensing chip 128.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A fingerprint identification device having a finger sensing area, the fingerprint identification device comprising:
a cover plate;
an image sensing chip located on one side of the cover plate;
a light guide member covering the image sensing chip, the light guide member including a light incident surface and a light emergent surface, the light emergent surface having a microstructure;
at least one light emitting element arranged adjacent to the light incident surface;
a collimating element between the light emergent surface and the image sensing chip; and
a refraction piece arranged between the collimation piece and the image sensing chip and comprising a plurality of refraction structures, wherein the outer diameters of the refraction structures are gradually reduced along the direction far away from the collimation piece and close to the image sensing chip to form a sharp angle, and the angles of the sharp angles of the refraction structures are gradually increased along the direction far away from the central line of the refraction piece;
wherein the image sensing chip and the at least one light-emitting element are mounted on the upper surface of a substrate;
the image sensing chip comprises a plurality of sensing pixels, and when the length of the image sensing chip on a cross section formed by optical axes of the sensing pixels is a, and the length of the finger sensing area on the cross section is b, the following conditions are satisfied:
b≥2a。
2. The apparatus of claim 1, wherein the number of the sensing pixels is the same as the number of the refraction structures.
3. The apparatus of claim 1, wherein the number of the sensing pixels is less than the number of the refraction structures.
4. The apparatus of claim 1, further comprising a plurality of microlenses respectively disposed on the plurality of sensing pixels.
5. The fingerprint identification device according to claim 1 wherein said collimating member comprises a plurality of light-shielding portions and a plurality of light-transmitting portions, said plurality of light-shielding portions and said plurality of light-transmitting portions being staggered, and said plurality of light-transmitting portions being disposed in correspondence to said plurality of light-refracting structures.
6. The apparatus of claim 1, wherein the light-deflecting member further comprises a base portion, the plurality of light-deflecting structures are disposed on the base portion, and an outer diameter of each light-deflecting structure tapers away from the base portion to form the sharp angle.
7. The apparatus of claim 1, wherein the outer surface of the refractive structures is a plane or a curved surface.
8. The fingerprint identification device of claim 1, further comprising a light shaping element disposed between the light exit surface and the collimating element.
9. The apparatus of claim 1, further comprising:
the first adhesion piece is arranged between the cover plate and the light outlet surface; and
the second adhesion piece is arranged between the light-emitting surface and the collimation piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710183302.0A CN108629253B (en) | 2017-03-24 | 2017-03-24 | Fingerprint identification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710183302.0A CN108629253B (en) | 2017-03-24 | 2017-03-24 | Fingerprint identification device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108629253A CN108629253A (en) | 2018-10-09 |
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