CN210776721U - Under-screen fingerprint identification system for purifying fingerprint image - Google Patents
Under-screen fingerprint identification system for purifying fingerprint image Download PDFInfo
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- CN210776721U CN210776721U CN201921865489.3U CN201921865489U CN210776721U CN 210776721 U CN210776721 U CN 210776721U CN 201921865489 U CN201921865489 U CN 201921865489U CN 210776721 U CN210776721 U CN 210776721U
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Abstract
A fingerprint identification system under screen for purifying fingerprint image features that a light filter element is arranged at least one of the light inlet and light outlet of light guide panel, and after the light filter element is used to filter light, the first part of light at a specified angle or wavelength range is led out from the light outlet, and the second part of light at a specified angle or wavelength range is not led out.
Description
Technical Field
The present invention relates to an identification technique for fingerprint under screen, and more particularly to an identification system for fingerprint under screen of purified fingerprint image.
Background
Fingerprint identification is one of biological characteristic identification technologies, which utilizes unique fingerprint information on human fingers to carry out identification, and has wide application in the aspects of safety and convenience; for example, most of today's smart phones have a fingerprint recognition function, which can provide fingerprint encryption and fingerprint unlocking.
Based on the trend of the panel market, combining the fingerprint recognition function and the display function of the display panel is a popular topic of the industry. In the method of integrating or integrating the fingerprint recognition system into the display panel, if the related elements for fingerprint recognition are disposed above the display panel, the silicon wafer-based photosensitive element is opaque and exposed outside the display panel, and the lower portion of the display panel has a problem of transmittance, which may not receive the reflected light of the fingerprint well, thereby affecting the accuracy of fingerprint recognition. Therefore, there is a limit to incorporating the fingerprint recognition system into the display panel, and it is difficult to prevent the design of the product from being disturbed.
Currently, an underscreen fingerprint identification technology using the principle of optical Total internal reflection (FTIR) is actively developed, which can break through the appearance limitation of the conventional fingerprint identification product. However, in order to achieve a high screen ratio and a small volume of the optical module, the angle of the incident light cannot be collimated, so that many noises often enter the light guide panel, which causes the image to generate ghost images at different angles, thereby affecting the accuracy of fingerprint identification.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, an object of the present invention is to provide a fingerprint identification system under a screen for purifying fingerprint images, wherein a light-filtering element is disposed at a light-entering end or a light-emitting end of a light-guiding panel, so that the light source angle or wavelength range inside the light-guiding panel can be reduced, and the effect of removing the overlapped image of the fingerprint images can be achieved.
Therefore, in order to achieve the above object, the present invention provides a fingerprint identification system under a screen for purifying fingerprint images, which mainly comprises a light guide panel, a light source, a filter element, a signal amplifier and a photosensitive element. The surface of the light guide panel is provided with a fingerprint sensing area for a finger to press, and the light guide panel is provided with a light inlet end and a light outlet end. The light source is used for emitting light, guiding the light into the light guide panel from the light inlet end and transmitting the light in the light guide panel through the internal total reflection effect. The light filtering element is arranged at least one of the light inlet end and the light outlet end and is used for filtering light rays, so that a first part of the light rays within a specified angle or wavelength range is led out from the light outlet end, and a second part of the light rays outside the specified angle or wavelength range is not led out. The signal amplifier receives the first part of the light, amplifies the first part and then leads out the first part. The photosensitive element is back to the fingerprint sensing area, receives the first part of the light amplified by the signal amplifier and processes the first part into a fingerprint image, thereby achieving the purpose of fingerprint identification.
According to an embodiment of the present invention, the filter element has at least one hole or slit, so that the first part of the light can pass through the hole or slit and the second part of the light can not pass through the hole or slit.
According to an embodiment of the present invention, the light filter element is a multi-layer filter film, so that the first part of the light can penetrate through the multi-layer filter film and the second part of the light cannot penetrate through the multi-layer filter film.
According to the present invention, the light guide panel is provided with a first light guide portion and a second light guide portion adjacent to the light incident end and the light emitting end, so that the light incident end transmits to the fingerprint sensing area via the first light guide portion and transmits to the light emitting end via the second light guide portion.
According to an embodiment of the present invention, the light filtering element is a reflective coating located on a partial surface of the first light guiding part or the second light guiding part, so that the first part of the light is reflected by the reflective coating and the second part of the light is not reflected by the reflective coating.
According to an embodiment of the present invention, the light filtering element is a reflective coating on a surface of at least one of the first light guiding part and the second light guiding part, the reflective coating has a planar reflective area and a chamfer, so that the first portion of the light is reflected by the reflective area of the reflective coating, and the second portion of the light is not guided into the signal amplifier and the sensing element by the chamfer of the reflective coating.
According to an embodiment of the present invention, the specified wavelength range is between 380-1400 nanometers (nm).
According to the utility model discloses an embodiment, wherein appointed angle scope is the contained angle of the advancing direction of light and the surface of light guide panel or the normal direction of bottom surface, and this appointed angle scope is 0 ~ 10 degrees.
The utility model provides a fingerprint identification system under purification fingerprint image's screen utilizes filter element to filter incident light's angle and wavelength for some light that accords with in appointed angle or the wavelength range can be derived and listened, and does not derive all the other parts, and the quality of avoiding producing unnecessary noise and disturbing sensing, thereby can improve fingerprint image's the rate of discernment.
The purpose, technical content, features and effects of the present invention will be more readily understood by the following detailed description of the embodiments. The following detailed description of the embodiments with reference to the drawings will be made to facilitate understanding of the objects, technical contents, features and effects of the present invention.
Drawings
Fig. 1 is a cross-sectional view of a fingerprint identification system under a screen for purifying a fingerprint image according to a first embodiment of the present invention.
Fig. 2 is a bottom view of the under-screen fingerprint identification system for purifying fingerprint images according to the first embodiment of the present invention.
Fig. 3 is a cross-sectional view of an off-screen fingerprint identification system for purifying fingerprint images according to a second embodiment of the present invention.
Fig. 4 is a cross-sectional view of an off-screen fingerprint identification system for purifying fingerprint images according to a third embodiment of the present invention.
Fig. 5 is a top view of an off-screen fingerprint identification system for purifying fingerprint images according to a third embodiment of the present invention.
Fig. 6 is a cross-sectional view of an off-screen fingerprint identification system for purifying fingerprint images according to a fourth embodiment of the present invention.
Fig. 7 is a schematic view of the combination of the under-screen fingerprint identification system for purifying fingerprint images and the display panel according to the fifth embodiment of the present invention.
Description of reference numerals: 20-an underscreen fingerprint identification system; 21-a light guide panel; 211-a fingerprint sensing area; 212-light input end; 213-light-emitting end; 214-a first light directing portion; 215-a second light directing portion; 216-optical glue; 22-a light source; 23-a signal amplifier; 24-a photosensitive element; 25-a filter element; 251-a slit; 252-a multilayer filter film; 253-reflection coating; 254-reflection coating; 255-chamfering; 256-reflection area; 30-a display panel; a-a finger; d1、d2-a width; l is1、L2-length, z-thickness, theta-angle of incidence, α -angle.
Detailed Description
Referring to fig. 1 and 2, a cross-sectional view and a bottom view of an off-screen fingerprint identification system 20 for purifying fingerprint images according to a first embodiment of the present invention are shown. The under-screen fingerprint identification system 20 is mainly composed of a light guide panel 21, a light source 22, a filter element 25, a signal amplifier 23 and a photosensitive element 24.
In this embodiment, the surface of the light guide panel 21 has a fingerprint sensing area 211 for being pressed by a finger a; in practical applications, the fingerprint sensing area 211 may be disposed on the whole area or a partial area of the surface of the light guide panel 21. In this embodiment, the light guide panel 21 has a light incident end 212 and a light exiting end 213 at two sides, and the light incident end 212 and the light exiting end 213 are respectively provided with a first light guide portion 214 and a second light guide portion 215, specifically, the first light guide portion 214 and the second light guide portion 215 can be reflectors for adjusting the transmission angle of light; in practical applications, the positions of the light incident end 212 and the light exiting end 213 can also be designed at the middle cut end of the light guide panel 21. The light guide panel 21 may be made of glass, the first light guide portion 214 and the second light guide portion 215 may be in the form of a mirror surface or an optical fiber, and the first light guide portion 214 and the second light guide portion 215 may be separately disposed with respect to the light guide panel 21, but of course, the first light guide portion 214 and the second light guide portion 215 may also be designed to be integrated with the light guide panel 21.
In this embodiment, the light source 22 is adjacent to the first light guide portion 214 and emits light toward the first light guide portion 214, and the light passes through the light entrance end 212, is reflected or transmitted to the light guide panel 21 through the first light guide portion 214, is transmitted by Total Internal Reflection (TIR) effect through Reflection of the fingerprint sensing area 211, and is transmitted to the light exit end 213, and is reflected or transmitted through the second light guide portion 215.
To further explain, in order to allow the light to be totally internally reflected in the light guide panel 21, the minimum angles between the light and the normal direction of the surface or the bottom surface of the light guide panel 21 (herein, for convenience of the following description, abbreviated as the incident angle θ) are arcsin (n) respectively0/n2) And arcsin (n)1/n2) So as to achieve total internal reflection. Therefore, when the light travels in the light guide panel 21, the incident angle θ should be larger than the minimum angle required by the two total internal reflections, i.e. the incident angle θ should be larger than arcsin (n)0/n2) And arcsin (n)1/n2)；
Wherein n is0Is the refractive index of the surface of the light guide panel 21;
n1is the refractive index of the bottom surface of the light guide panel 21; and
n2is the refractive index of the light guide panel 21.
In this embodiment, the refractive index of the light guide panel 21 is 1.5, and when both the surface and the bottom surface of the light guide panel 21 are adjacent to the air, the angle between the traveling direction of the light in the light guide panel 21 and the normal direction of the surface or the bottom surface thereof, i.e., the incident angle θ, is greater than 43 degrees; when only one of the surface and the bottom surface of the light guide panel 21 is adjacent to air and the other surface is adjacent to a material with a refractive index of 1.4, the angle between the traveling direction of the light in the light guide panel 21 and the normal direction of the surface or the bottom surface thereof, i.e., the incident angle θ, is greater than 70 degrees.
Furthermore, the wavelength of the light can be 380-1400 nanometers (nm); in practical applications, the light source can be divided into a visible light range (380-780 nm) and a near infrared range (780-1400 nm). Further, when using wavelengths in the visible range, which are visible to the naked eye, different wavelengths can be used to mark as active or inactive areas, to assist the user in knowing the available areas; when a wavelength in the near infrared range is used, it is invisible to the naked eye, and is suitable for use under a display panel (under display) or in an environment where the requirement is not perceived by the user.
In the above embodiments, the light source 22 is used to provide collimated light, and specifically, may be a collimated light source of Laser (Laser), Vertical Cavity Surface Emitting Laser (VCSEL), or a combination of a non-collimated light source and a secondary optical element; further, the secondary optical element may be selected from the group consisting of Parabolic (Parabolic surface) condensers, Compound Parabolic Condensers (CPCs), lenses, prisms, Fresnel lenses (Fresnel lenses), and combinations thereof. Alternatively, the light source 22 may provide uncollimated light, and a high-order angular filter may be disposed on the side of the photosensitive element 24, so as to achieve fingerprint imaging. For detailed features of various embodiments of the light source 22, reference may be made to the optical fingerprint recognition system described in taiwan No. 106145847, which is incorporated herein by reference for brevity.
In the present invention, in order to limit the light transmitted in the light guide panel 21 to a specific angle or wavelength range, the generation of noise is avoided to remove the ghost of the fingerprint image, so the light emitted from the light source 22 is filtered by the filter element 25, and the led light can be reduced to a specific angle or wavelength range; the preferred range of the designated wavelength is about 380 to 1400 nanometers (nm), and the designated angle range is an included angle between the traveling direction of the light and the normal direction of the surface or the bottom surface of the light guide panel 21, and the preferred designated angle range is 0 to 10 degrees.
In this embodiment, the filter element 25 is disposed at the light-entering end 212 and the light-exiting end 213 on two sides of the light guide panel 21, and is used for filtering the light emitted by the light source 22, so that a first portion of the light within a specified angle or wavelength range is led out from the light-exiting end 213, and a second portion of the light outside the specified angle or wavelength range is not led out. In this embodiment, a light filter 25 is disposed at each of the light input end 212 and the light output end 213 to minimize the angle or wavelength range of the light entering and exiting the light guide panel 21; in practical applications, the filter element 25 may be disposed only at the light-incident end 212 or the light-emitting end 213.
Furthermore, the filter element 25 of the present embodiment has a hollow slit 251, the slit 251 needs to be located on the light guide panel 21 in the vertical projection direction of the light source 22 and the signal amplifier 23, the penetration rate of the slit 251 material to the light source 22 is preferably less than 1%, as shown in fig. 2, the width d of the slit 2511Less than 0.5 millimeter (mm), preferably less than 0.3mm, and less than 2mm thick. In addition, the slit length L at the light entrance end 2121A slit length L at the light exit end 213 smaller than the length of the light source 221Is smaller than the length of the signal amplifier 23 and is larger than the length of the light-sensing element 24, wherein the length direction of each element and the length L of the slit 2511The directions are the same. In addition, the filter element 25 may be designed to have a slit, or may have a single hole or a plurality of holes arranged in an array, or the holes may be circular holes or other geometric shapes, such as a rectangle; in practice, it is only necessary that the slit or the hole has a structure designed to allow the first part of the light to pass through and the second part of the light not to pass through.
In this embodiment, the signal amplifier 23 is adjacent to the second light guiding portion 215, and is configured to receive a first portion of the light guided by the second light guiding portion 215, amplify the first portion, and then guide the amplified first portion; the signal amplifier 23 may be in the form of a mirror.
In the present embodiment, the photosensitive element 24 is adjacent to the signal amplifier 23, and is used for receiving the first portion of the light amplified by the signal amplifier 23 and processing the first portion into a fingerprint image, thereby achieving the purpose of fingerprint identification.
In the above embodiments, a lens, a Prism film (Prism film), an angle filter (Angular filter) or a combination thereof may be further included between the photosensitive element 24 and the signal amplifier 23. For detailed features of various implementation aspects of the photosensitive element 24 and the signal amplifier 23, please refer to the optical fingerprint recognition system described in taiwan No. 106145847, which is incorporated herein by reference.
The utility model discloses a fingerprint identification system 20 is under screen is in using, press the fingerprint sensing region 211 on light guide panel 21 surface with finger A when the user, can cause the destruction of light total internal reflection in light guide panel 21, filter light by filter element 25, make light guide panel 21 only derive the first part that accords with the light in appointed angle or the wavelength range, and do not derive all the other parts (be the second part of light), the event can not cause there is unnecessary noise, photosensitive element 24 can detect the first part of light more accurately, and handle a clear fingerprint image, reach the purpose that promotes the fingerprint identification effect.
In addition, referring to fig. 3, a cross-sectional view of an off-screen fingerprint identification system 20 for purifying fingerprint images according to a second embodiment of the present invention is shown.
In this embodiment, the filter element 25 includes a plurality of filter films 252 respectively disposed at the light-entering end 212 and the light-exiting end 213 of the light guide panel 21, and one of the light-entering end 212 and the light-exiting end 213 of the filter films 252 can be selected to be disposed, so that a first portion of the light can penetrate through the filter films 252, and a second portion of the light cannot penetrate through the filter films, thereby reducing the angle or wavelength range of the light entering or exiting the light guide panel 21. Specifically, the multi-layer filter film 252 of the present embodiment is formed by matching materials with high refractive index and low refractive index, such as titanium dioxide (TiO)2) With silicon dioxide (SiO)2) The number of stacked layers of the two is greater than 20, the total thickness is less than 5 micrometers (um), the transmittance of the light emitted by the light source 22 is greater than 80%, and preferably, there is a filtering mechanism for the angle, for example, if the traveling direction of the light is parallel to the normal direction of the surface or bottom surface of the light guide panel 21 within 0 to 10 degrees, the light can pass through the multilayer filtering film 252, and if the included angle between the traveling direction of the light and the normal direction of the surface or bottom surface of the light guide panel 21 is greater than 10 degrees, the light cannot penetrate through the multilayer filtering film 252, and certainly, the smaller the angle of the filtered light is, the better.
Referring to fig. 4 and 5, a cross-sectional view and a top view of an off-screen fingerprint identification system 20 for purifying fingerprint images according to a third embodiment of the present invention are respectively shown.
In this embodiment, the filter element 25 includes reflective coatings 253 respectively disposed on partial surfaces of the first light guide part 214 and the second light guide part 215 of the light guide panel 21, and the reflective coatings 253 may be disposed selectively on one of two ends of the first light guide part 214 and the second light guide part 215, so that a first portion of the light is reflected by the reflective coatings 253 and a second portion of the light is not reflected by the reflective coatings 253. In this embodiment, the reflectivity of the reflective coating 253 to the light emitted by the light source 22 is greater than 80%, which can be penetrated by the visible light source, and the light of the remaining bands is reflected in the light guide panel 21. Further, the smaller the area of the reflective coating 253, the smaller the angular range of the light that can enter or exit the light guide panel 21. In this embodiment, the width d of the reflective coating 2532Reduced from z/cot α to less than 0.5z/cot α, and length L of reflective coating 2532Is longer than the length of the photosensitive element 24, wherein z is the thickness of the light guide panel 21, α is the included angle between the first light guide part 214 or the second light guide part 215 and the bottom surface of the light guide panel 21, and the length direction of the photosensitive element 24 and the length L of the reflective coating2The directions are the same.
Referring to fig. 6, a cross-sectional view of an off-screen fingerprint identification system 20 for purifying fingerprint images according to a fourth embodiment of the present invention is shown.
In the present embodiment, the filter element 25 is the reflective coating 254 formed on the surfaces of the first light guide part 214 and the second light guide part 215 of the light guide panel 21, and one of the two ends of the reflective coating 254 may be selected to be disposed, the reflective coating 254 has a planar reflective area 256 in the center and chamfers 255 on the two sides, so that a first portion of the light incident into the reflective area 256 of the reflective coating 254 may be reflected and guided into the signal amplifier 23 and the sensing element 24, and a second portion of the light incident into the chamfers 255 of the reflective coating 254 may not pass through the reflective area 256 and may not be guided into the signal amplifier 23 and the sensing element 24. further, since the reflective coating 254 of the present embodiment has the chamfers 255, the reflective area 256 capable of effectively reflecting the light is reduced, the range of angles of the light meeting the aforementioned total internal reflection condition is also reduced.
In the present invention, the above embodiments can be combined in practical applications for various specific aspects provided by the filter element 25, for example, the filter element 25 can include a slit 251 and a reflective coating 254 with a chamfer 255, or the filter element 25 can include a slit 251 and a reflective coating 253.
On the other hand, the present invention can be applied to a product integrating a fingerprint identification system under a screen and a display panel, as shown in fig. 7, in this embodiment, the light guide panel 21 is disposed above a display panel 30, and the light sensing element 24 is hidden at the back of the display panel 30; in practical applications, the light guide panel 21 may be adhered to the display panel 30 by coating optical adhesive 216 or dispensing according to design requirements, and in order to easily achieve full-surface fingerprint identification, the light guide panel 21 is preferably coated with optical adhesive on the entire bottom surface. Because the light sensor 24 of the present invention does not use the reflected light of the received fingerprint to detect, it will not cause the problem of insufficient penetration, and the application is more extensive.
Furthermore, the utility model discloses do the combination with the camera lens of fingerprint identification system under the screen and cell-phone, that is to say, the utility model discloses can reach photosensitive element 24 shares with the camera lens of cell-phone, let purification fingerprint image's fingerprint identification system 20 under the screen need not occupy too big structural space, make the volume of final product can refine the simplification. For the details of this part, please refer to the optical fingerprint recognition system described in taiwan No. 106145847, which is incorporated herein by reference, which is not repeated herein.
In the embodiment of the present invention, the relationship between the light guide panel 21 and the first light guide portion 214 and the second light guide portion 215, the type, shape, quantity, relative position, etc. of the light source 22, the light filter element 25, the signal amplifier 23, and the light sensing element 24 is only used as an example, and not limited thereto, and any person equal to the spirit of the present application does not depart from the scope of the present invention.
In conclusion, according to the utility model discloses a fingerprint identification system under purification fingerprint image's screen uses light can carry out the principle of total internal reflection effect transmission in the leaded light panel and detect the fingerprint, and in order to avoid the interference of noise, the utility model discloses the light that will carry out transmission in the leaded light panel filters via light filtering element, screens incident light's angle or wavelength, only derives in the part of specified angle or wavelength range in the light, and all the other parts then are not derived, can effectively solve to have the problem of overlapping the shadow under the screen on the fingerprint image easily, are favorable to promoting the identification rate of fingerprint sensing.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all the equivalent changes or modifications of the features and spirit described in the application scope of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The utility model provides a purification fingerprint image's fingerprint identification system under screen which characterized in that includes:
the light guide panel is provided with a light inlet end and a light outlet end, and the surface of the light guide panel is provided with a fingerprint sensing area for being pressed by a finger;
a light source for emitting a light beam, which is guided into the light guide panel from the light inlet end and reflected by the fingerprint sensing area to perform transmission of total internal reflection effect;
a light filter element, which is arranged at least one of the light inlet end and the light outlet end and is used for filtering the light, so that a first part of the light within a specified angle or wavelength range is led out from the light outlet end, and a second part of the light outside the specified angle or wavelength range is not led out;
a signal amplifier for receiving the first part of the light and amplifying the first part; and
and the photosensitive element is opposite to the fingerprint sensing area, receives the first part of the light amplified by the signal amplifier and processes the first part into a fingerprint image.
2. The system of claim 1, wherein the filter element has at least one aperture or slit, such that the first portion of the light passes through the aperture or slit and the second portion of the light does not pass through the aperture or slit.
3. The system of claim 1, wherein the filter element is a multi-layer filter film, such that the first portion of the light passes through the multi-layer filter film and the second portion of the light is opaque.
4. The system of claim 1, wherein the light guide panel is further provided with a first light guide portion and a second light guide portion adjacent to the light input end and the light output end, respectively, such that the light guided by the light input end is transmitted to the fingerprint sensing area through the first light guide portion and transmitted to the light output end through the second light guide portion.
5. The system of claim 4, wherein the filter element is a reflective coating on a local surface of at least one of the first light guide portion and the second light guide portion, such that the first portion of the light is reflected by the reflective coating and the second portion of the light is not reflected by the reflective coating.
6. The system of claim 4, wherein the filter element is a reflective coating on a surface of at least one of the first light guide portion and the second light guide portion, the reflective coating having a planar reflective area and a chamfer such that the first portion of the light is reflected by the reflective area of the reflective coating and the second portion of the light passes through the chamfer of the reflective coating without being directed into the signal amplifier and the sensing element.
7. The system of claim 1, wherein the fingerprint sensing area is all or a portion of the surface of the light guide panel.
8. The system of claim 1, wherein the light guide panel is disposed above a display panel.
9. The system of claim 1, wherein the light source is a collimated light source or a combination of a non-collimated light source and secondary optics.
10. The system of claim 9, wherein the collimated light source is a laser or a vertical cavity surface emitting laser.
11. The system of claim 1, wherein the specified wavelength range is between 380 nm and 1400 nm.
12. The system of claim 1, wherein the predetermined angle range is an angle between the light traveling direction and a normal direction of the surface or a bottom surface of the light guide panel, and the predetermined angle range is 0 to 10 degrees.
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| CN201921865489.3U CN210776721U (en) | 2019-10-31 | 2019-10-31 | Under-screen fingerprint identification system for purifying fingerprint image |
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| CN201921865489.3U CN210776721U (en) | 2019-10-31 | 2019-10-31 | Under-screen fingerprint identification system for purifying fingerprint image |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4224363A4 (en) * | 2020-11-12 | 2024-03-20 | Huawei Tech Co Ltd | Electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP4224363A4 (en) * | 2020-11-12 | 2024-03-20 | Huawei Tech Co Ltd | Electronic device |
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Effective date of registration: 20220117 Address after: 802 Hibiscus Road, West Bay Avenue, Grand Cayman, Cayman Islands Patentee after: FOCALTECH ELECTRONICS, Ltd. Address before: Room 102, Connor Street, 712 North Voice Road Post Box, Georgetown, Grand Cayman Island, Cayman Islands Patentee before: Dunjie Optoelectronics (Cayman) Co.,Ltd. |
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