CN210572976U - Fingerprint sensing module - Google Patents
Fingerprint sensing module Download PDFInfo
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- CN210572976U CN210572976U CN201921479394.8U CN201921479394U CN210572976U CN 210572976 U CN210572976 U CN 210572976U CN 201921479394 U CN201921479394 U CN 201921479394U CN 210572976 U CN210572976 U CN 210572976U
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- 238000003384 imaging method Methods 0.000 claims abstract description 44
- 230000015572 biosynthetic process Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 235000012489 doughnuts Nutrition 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
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- 240000005528 Arctium lappa Species 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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Abstract
The utility model provides a fingerprint sensing module disposes in the display panel below, and fingerprint sensing module includes image sensor and formation of image lens group. The imaging lens group is configured between the image sensor and the display panel, and the imaging lens group sequentially comprises a first lens, a second lens, an aperture diaphragm and a third lens from one side close to the display panel to one side close to the image sensor. The first lens has a negative refractive power, the second lens has a positive refractive power, and the third lens has a positive refractive power, wherein an effective focal length of the imaging lens group falls within a range of 3 mm to 5 mm. The fingerprint sensing module can provide good fingerprint identification effect.
Description
Technical Field
The present invention relates to a sensing module, and more particularly, to a fingerprint sensing module.
Background
With the popularization and progress of mobile devices, the security and privacy of mobile devices are gradually being recognized, and various identity recognition devices have been developed. The fingerprint identification device is one of the fast and accurate identification devices. In conventional mobile devices, capacitive fingerprint sensors are widely used due to their low cost, high accuracy and high response speed. However, the capacitive fingerprint sensor is usually disposed on the front side or the back side of the mobile device, which may cause a reduction in the screen occupation ratio, and the back side may not perform fingerprint recognition when the mobile device is placed on a desktop.
Under the background of the application, a fingerprint identification scheme under the screen is developed, that is, a fingerprint sensor is placed under the display panel, so that the screen occupation ratio is not sacrificed, and the fingerprint identification can be achieved by touching the front surface of the display panel with a finger. The current scheme for identifying fingerprints under a screen is divided into ultrasonic fingerprint identification and optical fingerprint identification. The problem of low yield of the conventional ultrasonic fingerprint sensor is difficult to overcome. The optical fingerprint sensor is an image sensor that irradiates a finger with light emitted from a display panel and images the light reflected from the finger under a lens. However, the imaging quality on the image sensor is critical to the accuracy and success rate of fingerprint identification.
SUMMERY OF THE UTILITY MODEL
The utility model provides a fingerprint sensing module, it can provide good fingerprint identification effect.
An embodiment of the utility model provides a fingerprint sensing module, its characterized in that, fingerprint sensing module disposes in the display panel below, and fingerprint sensing module includes image sensor and formation of image lens group. The imaging lens group is disposed between the image sensor and the display panel, and the imaging lens group sequentially includes a first lens, a second lens, an aperture stop (aperture stop) and a third lens from a side close to the display panel to a side close to the image sensor. The first lens has a negative refractive power, the second lens has a positive refractive power, and the third lens has a positive refractive power, wherein an effective focal length of the imaging lens group falls within a range of 3 mm to 5 mm.
In an embodiment of the present invention, the first lens has a convex surface facing the display panel.
In an embodiment of the present invention, the third lens has a convex surface facing the image sensor.
In an embodiment of the present invention, the imaging lens assembly further includes a light shielding plate disposed between the edge of the first lens element and the edge of the second lens element.
In an embodiment of the present invention, the fingerprint sensing module further includes a leaning structure, wherein the imaging lens set leans on the leaning structure, and the leaning structure is located between an edge of the imaging lens set and an edge of the image sensor.
In an embodiment of the present invention, the third lens is supported by the supporting structure.
In an embodiment of the present invention, the fingerprint sensing module further includes a lens barrel structure, wherein the imaging lens assembly is disposed in the lens barrel structure, and the bearing structure is connected to an inside of one end of the lens barrel structure.
In an embodiment of the present invention, the imaging lens assembly further includes an infrared light cut-off filter disposed in the lens barrel structure, and the support structure is located between the third lens element and the infrared light cut-off filter.
In an embodiment of the present invention, the imaging lens assembly further includes a fourth lens disposed between the aperture stop and the third lens, and having a negative refractive power.
In an embodiment of the present invention, the first lens is an aspheric lens.
The utility model discloses an in the embodiment, the formation of image lens group includes first lens, second lens, aperture diaphragm and third lens according to the preface by one side to the one side that is close to image sensor that is close to display panel, and first lens has negative diopter, and the second lens has positive diopter, and the third lens has positive diopter, and wherein the effective focal length of formation of image lens group falls in 3 millimeters to 5 millimeters within ranges. Consequently, the formation of image lens group can provide good formation of image quality, and then makes the utility model discloses a fingerprint sensing module of embodiment can provide good fingerprint identification effect.
In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic cross-sectional view of a fingerprint sensing module according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a fingerprint sensing module according to another embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view of a fingerprint sensing module according to another embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view of a fingerprint sensing module according to a comparative example of the present invention.
Detailed Description
Fig. 1 is a schematic cross-sectional view of a fingerprint sensing module according to an embodiment of the present invention. Referring to fig. 1, the fingerprint sensing module 100 of the present embodiment is disposed below the display panel 50, the display panel 50 is, for example, an organic light-emitting diode (OLED) panel, a Liquid Crystal Display (LCD) panel or other suitable display panel, and the display panel 50 is, for example, a transparent display panel, or the display panel 50 has a transparent area above the fingerprint sensing module 100, so that the fingerprint sensing module 100 can shoot an image of a finger pressed on the display panel 50 through the transparent area.
The fingerprint sensing module 100 includes an image sensor 110 and an imaging lens group 200. The imaging lens assembly 200 is disposed between the image sensor 110 and the display panel 50, and the imaging lens assembly 200 sequentially includes a first lens 210, a second lens 220, an aperture stop 250 and a third lens 230 from a side close to the display panel 50 to a side close to the image sensor 110. The first lens 210 has a negative refractive power, the second lens 220 has a positive refractive power, and the third lens 230 has a positive refractive power.
In the present embodiment, the effective focal length of the imaging lens group 200 falls within a range of 3 mm to 5 mm. In addition, in the present embodiment, the imaging lens assembly 200 may optionally further include a fourth lens 240 disposed between the aperture stop 250 and the third lens 230 and having a negative refractive power. However, in other embodiments, the imaging lens assembly 200 may also have three lens elements (such as the first lens element 210, the second lens element 220 and the third lens element 230) without the fourth lens element 240. In the present embodiment, a surface 212 of the first lens 210 facing the display panel 50 is an aspheric surface, a surface 214 of the first lens 210 facing the image sensor 110 is an aspheric surface, and the first lens 210 is an aspheric lens. The surface 222 of the second lens 220 facing the display panel 50 is a convex surface, such as a convex aspheric surface, the surface 224 of the second lens 220 facing the image sensor 110 is a convex surface, such as a convex aspheric surface, and the second lens 220 is an aspheric lens. The surface 232 of the third lens element 230 facing the display panel 50 and the surface 234 facing the image sensor 110 are convex surfaces, such as convex aspheric surfaces, and the third lens element 230 is a biconvex lens and is an aspheric lens. A surface 242 of the fourth lens 240 facing the display panel 50 is a concave surface, such as a concave aspheric surface, and a surface 244 of the fourth lens 240 facing the image sensor 110 is a flat surface, and the fourth lens 240 is an aspheric lens, for example.
In the present embodiment, the fingerprint sensing module 100 further includes a bearing structure 122, wherein the imaging lens assembly 200 bears on the bearing structure 122, and the bearing structure 122 is located between an edge of the imaging lens assembly 200 and an edge of the image sensor 110. In this embodiment, the third lens 230 rests on the resting structure 122. The fingerprint sensing module 100 further includes a lens barrel structure 124, wherein the imaging lens assembly 200 is disposed in the lens barrel structure 124, and the bearing structure 122 is connected to an inside of one end of the lens barrel structure 124. In the present embodiment, the bearing structure 122 and the lens barrel structure 124 can be integrally formed.
In this embodiment, the display panel 50 emits a light beam 52 to illuminate the user's finger in the area above the image sensor 110, and the finger 60 reflects the light beam 52 to a light beam 54 with fingerprint information. The light beam 54 sequentially passes through the display panel 50 and the imaging lens assembly 200 from a finger to form a fingerprint image on the image sensor 110.
In the present embodiment, the imaging lens assembly 200 sequentially includes a first lens 210, a second lens 220, an aperture stop 250 and a third lens 230 from a side close to the display panel 50 to a side close to the image sensor 110, wherein the first lens 210 has a negative refractive power, the second lens 220 has a positive refractive power, and the third lens 230 has a positive refractive power, so the imaging lens assembly 200 can provide a good imaging quality, and the fingerprint sensing module 100 can provide a good fingerprint identification effect.
Fig. 2 is a schematic cross-sectional view of a fingerprint sensing module according to another embodiment of the present invention. Referring to fig. 2, the fingerprint sensing module 100a of the present embodiment is similar to the fingerprint sensing module 100 of fig. 1, and the main differences between the two are as follows. The imaging lens assembly 200a of the fingerprint sensing module 100a of the present embodiment includes three lens elements (i.e., the first lens element 210a, the second lens element 220a and the third lens element 230a), but does not include the fourth lens element 240 shown in fig. 1. In addition, a surface 212a of the first lens 210a facing the display panel 50 is a convex surface, such as a convex aspheric surface, a surface 214a of the first lens 210a facing the image sensor 110 is a convex surface, such as a convex aspheric surface, and the first lens 210a is an aspheric lens. The surface 222a of the second lens 220a facing the display panel 50 is a convex surface, such as a convex aspheric surface, the surface 224a of the second lens 220a facing the image sensor 110 is a concave surface, such as a concave aspheric surface, and the second lens 220a is an aspheric lens. The surface 232a of the third lens 230a facing the display panel 50 is a concave surface, such as a concave aspheric surface, and the surface 234a of the third lens 230a facing the image sensor 110 is a convex surface, such as a convex aspheric surface, and the third lens 230a is an aspheric lens.
Fig. 3 is a schematic cross-sectional view of a fingerprint sensing module according to another embodiment of the present invention. Referring to fig. 3, the fingerprint sensing module 100b of the present embodiment is similar to the fingerprint sensing module 100a of fig. 2, and the main differences are as follows. In the imaging lens assembly 200a of the present embodiment, a surface 214b of the first lens element 210b facing the image sensor 110 is a concave surface, such as a concave aspheric surface, a surface 232b of the third lens element 230b facing the display panel 50 is a convex surface, such as a convex aspheric surface, and the first lens element 210b and the third lens element 230b are aspheric lenses. In addition, the imaging lens assembly 200a further includes a light shielding sheet 270 disposed between the edge of the first lens element 210b and the edge of the second lens element 220 b. The gobo 270 may avoid donut ghost (donut ghost) generated at the image sensor 110, which will be described with a comparative example in the following.
Fig. 4 is a schematic cross-sectional view of a fingerprint sensing module according to a comparative example of the present invention. Referring to fig. 4, when the region 270c between the edge of the first lens 210b and the edge of the second lens 220c of the imaging lens assembly 200c of the fingerprint sensing module 100c is not provided with the light shielding sheet 270 shown in fig. 3, at least a portion of the light beam 52 emitted by the pixel 51 of the display panel 50 is reflected back to the metal layer 56 of the display panel 50 by the region 270c when the region 270c is irradiated with the light beam 52, and the light beam 52 reflected by the metal layer 56 sequentially passes through the first lens 210c, the second lens 220c, the aperture stop 250 and the third lens 230c to generate a doughnut-shaped ghost image, i.e., an annular bright ring, at the image sensor 110, thereby affecting the imaging quality of the imaging lens assembly 200 c. Therefore, disposing the light-shielding sheet 270 between the edge of the first lens 210b and the edge of the second lens 220b as in the embodiment of fig. 3 helps to suppress the formation of the doughnut-shaped ghost image.
Referring to fig. 3 again, the imaging lens assembly 200c of the present embodiment further includes an infrared light cut-off filter 280 disposed in the lens barrel structure 124, and the bearing structure 122 is located between the third lens element 230b and the infrared light cut-off filter 280. In the present embodiment, the light beam 52 emitted by the display panel 50 for fingerprint identification is, for example, visible light, and the infrared light cut filter 280 can filter infrared light in the environment, so as to improve the quality, such as the definition, of the fingerprint image on the image sensor 110. Alternatively, in another embodiment, the light beam 52 emitted by the display panel 50 for fingerprint identification is, for example, infrared light, and the infrared light cut-off filter 280 can filter infrared light wavelengths other than the infrared light wavelength emitted by the display panel 50, so as to improve the quality, such as the sharpness, of the fingerprint image on the image sensor 110.
In summary, the embodiment of the present invention provides an imaging lens assembly including a first lens, a second lens, an aperture stop and a third lens in sequence from one side close to a display panel to one side close to an image sensor, wherein the first lens has a negative diopter, the second lens has a positive diopter, and the third lens has a positive diopter, and an effective focal length of the imaging lens assembly falls within a range from 3 mm to 5 mm. Consequently, the formation of image lens group can provide good formation of image quality, and then makes the utility model discloses a fingerprint sensing module of embodiment can provide good fingerprint identification effect.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A fingerprint sensing module disposed under a display panel, the fingerprint sensing module comprising:
an image sensor; and
an imaging lens set disposed between the image sensor and the display panel, the imaging lens set sequentially comprising, from a side close to the display panel to a side close to the image sensor:
a first lens having a negative refractive power;
a second lens having a positive refractive power;
an aperture diaphragm; and
a third lens having a positive refractive power, wherein an effective focal length of the imaging lens group falls within a range of 3 mm to 5 mm.
2. The fingerprint sensing module of claim 1, wherein the first lens has a convex surface facing the display panel.
3. The fingerprint sensing module of claim 1, wherein the third lens has a convex surface facing the image sensor.
4. The fingerprint sensing module of claim 1, wherein the imaging lens assembly further comprises a light shield disposed between an edge of the first lens and an edge of the second lens.
5. The fingerprint sensing module of claim 1, further comprising a bearing structure, wherein the imaging lens group bears against the bearing structure, and the bearing structure is located between an edge of the imaging lens group and an edge of the image sensor.
6. The fingerprint sensing module of claim 5, wherein the third lens bears against the bearing structure.
7. The fingerprint sensing module according to claim 5, further comprising a barrel structure, wherein said imaging lens group is disposed in said barrel structure, and said bearing structure is connected to an interior of one end of said barrel structure.
8. The fingerprint sensing module of claim 7, wherein the imaging lens assembly further comprises an infrared light cut filter disposed in the lens barrel structure, and the bearing structure is located between the third lens and the infrared light cut filter.
9. The fingerprint sensing module of claim 1, wherein the imaging lens assembly further comprises a fourth lens disposed between the aperture stop and the third lens and having a negative refractive power.
10. The fingerprint sensing module of claim 9, wherein the first lens is an aspheric lens.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201862774338P | 2018-12-03 | 2018-12-03 | |
| US62/774,338 | 2018-12-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210572976U true CN210572976U (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921479394.8U Active CN210572976U (en) | 2018-12-03 | 2019-09-06 | Fingerprint sensing module |
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| Country | Link |
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| CN (1) | CN210572976U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023018023A1 (en) * | 2021-08-12 | 2023-02-16 | 삼성전자 주식회사 | Electronic device comprising fingerprint sensor |
| WO2023035277A1 (en) * | 2021-09-13 | 2023-03-16 | 迪克创新科技有限公司 | Lens system, optical fingerprint recognition apparatus, and terminal device |
| US11830281B2 (en) | 2021-08-12 | 2023-11-28 | Samsung Electronics Co., Ltd. | Electronic device including a fingerprint sensor |
-
2019
- 2019-09-06 CN CN201921479394.8U patent/CN210572976U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023018023A1 (en) * | 2021-08-12 | 2023-02-16 | 삼성전자 주식회사 | Electronic device comprising fingerprint sensor |
| US11830281B2 (en) | 2021-08-12 | 2023-11-28 | Samsung Electronics Co., Ltd. | Electronic device including a fingerprint sensor |
| WO2023035277A1 (en) * | 2021-09-13 | 2023-03-16 | 迪克创新科技有限公司 | Lens system, optical fingerprint recognition apparatus, and terminal device |
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Legal Events
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| IP01 | Partial invalidation of patent right | ||
| IP01 | Partial invalidation of patent right |
Commission number: 5W121342 Conclusion of examination: The patent remains valid on the basis of claims 1, 2, 4-6 and 8 submitted by the patentee on November 27, 2020 Decision date of declaring invalidation: 20210226 Decision number of declaring invalidation: 48389 Denomination of utility model: Fingerprint sensing module Granted publication date: 20200519 Patentee: Egis Technology Inc. |