CN112418093A - Fingerprint identification structure, display module assembly and display device - Google Patents
Fingerprint identification structure, display module assembly and display device Download PDFInfo
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- CN112418093A CN112418093A CN202011324889.0A CN202011324889A CN112418093A CN 112418093 A CN112418093 A CN 112418093A CN 202011324889 A CN202011324889 A CN 202011324889A CN 112418093 A CN112418093 A CN 112418093A
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- 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
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/143—Sensing or illuminating at different wavelengths
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
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Abstract
The utility model provides a fingerprint identification structure, display module assembly and display device belongs to and shows technical field, and it can solve the attack that current fingerprint system can not resist the false fingerprint of making through the printing mode, has the problem of security risk. The fingerprint identification structure of this disclosure includes: a plurality of fingerprint identification units arranged in an array; each fingerprint recognition unit includes: the color filter layer is positioned on one side of the light incident surface close to the optical sensors; the color filter layer is provided with a plurality of sub-identification areas with different colors; each sub-identification area is provided with a color filter with corresponding color and used for filtering light reflected by the fingerprint into light which corresponds to the color of the sub-identification area and carries color information; the optical sensor is used for collecting optical signals of light carrying color information and outputting the collected optical signals so as to enable the processor to identify the fingerprint as a true fingerprint or a false fingerprint.
Description
Technical Field
The utility model belongs to the technical field of show, concretely relates to fingerprint identification structure, display module assembly and display device.
Background
With the great popularization of the optical fingerprint identification technology in mobile intelligent terminal equipment, the optical fingerprint identification technology is more and more widely applied to scenes of fingerprint unlocking, mobile payment, software encryption and the like of terminal equipment such as mobile phones and the like, and people also put higher requirements on the safety of a fingerprint identification system in the terminal equipment.
At present, residual imprints or fingerprint pictures and the like of fingerprints on the surface of an object are obtained, and false fingerprints manufactured in a printing mode can be used for deceiving a fingerprint identification system, so that potential risks are brought. Therefore, false fingerprint attack is identified and resisted, and the method has important significance on the safety of the fingerprint identification system.
Disclosure of Invention
The present disclosure is directed to at least one of the technical problems in the prior art, and provides a fingerprint identification structure, a display module and a display device.
In a first aspect, an embodiment of the present disclosure provides a fingerprint identification structure, including: a plurality of fingerprint identification units arranged in an array; each fingerprint identification unit comprises: the color filter layer is positioned on one side close to the light incident surface of the optical sensor;
the color filter layer is provided with a plurality of sub-identification areas with different colors; each sub-identification area is provided with a color filter with corresponding color and used for filtering light reflected by the fingerprint into light which corresponds to the color of the sub-identification area and carries color information;
the optical sensor is used for collecting optical signals of light carrying color information and outputting the collected optical signals so as to enable the processor to identify the fingerprint as a true fingerprint or a false fingerprint.
Optionally, the sub-identification area at least comprises: any two of the red sub-identification area, the green sub-identification area and the blue sub-identification area.
Optionally, the color filter layer further has a hollow area;
the optical sensor is also used for collecting color information of light transmitted by the hollow area.
Optionally, the area of the hollowed-out area is greater than or equal to the area of each sub-identification area.
Optionally, the hollow-out area is provided with a filling layer; the material of the filling layer comprises: transparent material or white photoresist.
Optionally, the optical sensors each comprise: a photodiode.
In a second aspect, an embodiment of the present disclosure provides a display module including the fingerprint identification structure as provided above.
Optionally, the display module further includes: a display panel and a collimating structure;
the fingerprint identification structure is positioned on one side of the display surface which is far away from the display panel;
the collimating structure is located between the fingerprint identification structure and the display panel.
Optionally, the display module further includes: a backlight structure;
the fingerprint identification structure is positioned on one side of the light-emitting surface close to the backlight structure.
In a third aspect, an embodiment of the present disclosure provides a display device, including the display module provided as above.
Drawings
FIG. 1 is a schematic diagram of an exemplary display module;
fig. 2 is a schematic structural diagram of a fingerprint identification structure according to an embodiment of the present disclosure;
fig. 3a is a schematic structural diagram of a first color filter layer according to an embodiment of the disclosure;
fig. 3b is a schematic structural diagram of a second color filter layer according to an embodiment of the disclosure;
fig. 3c is a schematic structural diagram of a third color filter layer according to an embodiment of the disclosure;
fig. 3d is a schematic structural diagram of a fourth color filter layer according to an embodiment of the disclosure;
fig. 3e is a schematic structural diagram of a fifth color filter layer according to the disclosure;
fig. 3f is a schematic structural diagram of a fifth color filter layer according to an embodiment of the disclosure;
fig. 4 is a schematic structural diagram of a display module according to an embodiment of the disclosure;
fig. 5 is a schematic structural diagram of another display module according to an embodiment of the disclosure.
Detailed Description
For a better understanding of the technical aspects of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Fig. 1 is a schematic structural diagram of an exemplary display module, as shown in fig. 1, the display module includes: the display device comprises a display panel 101, an alignment structure 102 and a fingerprint identification structure 103, wherein the fingerprint identification structure 103 is located on the side of the display surface facing away from the display panel 101, and the alignment structure 102 is located between the fingerprint identification structure 103 and the display panel 101. The display panel 101 may be a self-Emitting Organic Light-Emitting Diode (OLED) display panel, when a finger is pressed onto the display panel 101, Light emitted from the display panel 101 is irradiated onto the surface of the finger, and a fingerprint of the finger may reflect the Light emitted from the display panel 101, pass through the collimating structure 102, and then irradiate onto the fingerprint identification structure 103. The reflection capacities of the valleys and the ridges in the fingerprint of the finger to light rays are different, so that an identification image of the fingerprint of the finger can be formed, the identification image of the fingerprint of the finger is compared with an image prestored in an image library, and if the identification image of the fingerprint of the finger is the same as the image prestored in the image library, the fingerprint of the finger is represented as an authentication fingerprint, so that fingerprint unlocking, mobile payment and software encryption are performed. If the identification image of the finger fingerprint is not the same as the pre-stored image in the image library, the finger fingerprint authentication is failed. At present, residual imprints or fingerprint pictures and the like of finger fingerprints on the surfaces of objects are obtained, false fingerprints manufactured in a printing mode can also form identification images the same as verification fingerprints to deceive a fingerprint identification system, the existing fingerprint identification system cannot identify the false fingerprints manufactured in the printing mode, and great potential risks exist. In order to solve at least one of the above technical problems, the present disclosure provides a fingerprint identification structure, a display module and a display device. The fingerprint identification structure, the display module and the display device provided by the present disclosure will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example one
Fig. 2 is a schematic structural diagram of a fingerprint identification structure provided in an embodiment of the present disclosure, and as shown in fig. 2, the fingerprint identification structure includes: a plurality of fingerprint identification units arranged in an array; each fingerprint recognition unit includes: a plurality of optical sensors 201 and a color filter layer 202 located on one side close to the light incident surface of the optical sensors 201; the color filter layer 202 has a plurality of sub-identification areas of different colors; each sub-identification area is provided with a color filter with corresponding color and used for filtering light reflected by the fingerprint into light which corresponds to the color of the sub-identification area and carries color information; the optical sensor 201 is used for collecting an optical signal of light carrying color information and outputting the collected optical signal for the processor to identify the fingerprint as a true fingerprint or a false fingerprint.
It should be noted that, after a lot of experiments, the reflection abilities of finger fingerprints for different wavelengths of light are different, and the reflection abilities of different finger fingerprints for the same wavelength are certain, for example, under the irradiation of a standard D65 light source, the tristimulus values of corresponding RGB colors of the finger fingerprints are around (28,25,19), and when different light sources are selected for irradiation, the corresponding RGB tristimulus values are different, but in a state within a small fluctuation range. When different finger fingerprints are used for testing, the corresponding RGB color tristimulus values are also certain, which shows that the reflection capability of the finger fingerprints of the human body to light rays with different wavelengths is almost certain, and the light rays with different wavelengths are irradiated on the finger fingerprints and have the color information specific to the finger fingerprints after being reflected.
In the fingerprint identification structure provided by the embodiment of the present disclosure, the color filter layer 202 has a plurality of sub-identification areas with different colors, and a color filter with a corresponding color is disposed in each sub-identification area, so that light reflected by a finger fingerprint can be filtered into monochromatic light with a corresponding color, for example, a red filter can filter white light into red light, a green filter can filter white light into green light, and a blue filter can filter white light into blue light. The optical sensor 201 can receive monochromatic light formed by filtering through the color filter layer 202, and since the reflection capacities of the finger fingerprints for light with different wavelengths are different and the reflection capacities of different finger fingerprints for the same wavelength are constant, the optical sensor 201 can collect different optical signals carrying various color information and output the collected optical signals so as to form an identification image of the finger fingerprint carrying various color information for the processor. For the false fingerprint manufactured by using the printing method, the optical sensor 201 can only collect black color information in the printed pattern of the false fingerprint to form an identification image carrying only one color information, which is different from the identification image formed by the real fingerprint, so that the function of identifying the fingerprint as a true fingerprint or a false fingerprint can be realized, the fingerprint identification system can have the function of resisting the attack of the false fingerprint, and the security level of the fingerprint identification system can be further improved.
In some embodiments, the sub-identification region includes at least: any two of the red sub-identification region R, the green sub-identification region G, and the blue sub-identification region B.
It should be noted that fig. 3a is a schematic structural diagram of a first color filter layer provided in this disclosure, as shown in fig. 3a, the color filter layer 202 has a red sub-identification area R and a green sub-identification area G, where the red sub-identification area R is provided with a red filter capable of filtering light reflected by a fingerprint into red light, which carries red color information, and the green sub-identification area G is provided with a green filter capable of filtering light reflected by a fingerprint into green light, which carries green color information, so that the optical sensor 201 can collect optical signals carrying the red color information and the green color information, so that the processor forms an identification image of a finger fingerprint carrying the red color information and the green color information. For the false fingerprint manufactured by using the printing method, the optical sensor 201 can only collect black color information in the printed pattern of the false fingerprint to form an identification image carrying only one color information, which is different from the identification image formed by the real fingerprint, so that the function of identifying the fingerprint as a true fingerprint or a false fingerprint can be realized, the fingerprint identification system can have the function of resisting the attack of the false fingerprint, and the security level of the fingerprint identification system can be further improved. It can be understood that the relative positions of the red sub-identification area R and the green sub-identification area G in fig. 3a may also be exchanged without affecting the function of the corresponding optical sensor 201, and the implementation principle thereof is the same as that of the color filter layer shown in fig. 3a, and is not described herein again. Fig. 3B is a schematic structural diagram of a second color filter layer according to an embodiment of the disclosure, and as shown in fig. 3B, the color filter layer 202 has a red sub-identification area R and a blue sub-identification area B, where the red sub-identification area R is provided with a red filter capable of filtering light reflected by a fingerprint into red light, which carries red color information, and the blue sub-identification area B is provided with a blue filter capable of filtering light reflected by a fingerprint into blue light, which carries blue color information, so that the optical sensor 201 can collect optical signals carrying red color information and blue color information, so that the processor forms an identification image of a finger fingerprint carrying red color information and blue color information. Because the false fingerprint made by the printing mode is different from the identification image formed by the real fingerprint, the function of identifying the fingerprint as the real fingerprint or the false fingerprint can be realized, thereby ensuring that the fingerprint identification system has the function of resisting the attack of the false fingerprint and further improving the safety level of the fingerprint identification system. Fig. 3c is a schematic structural diagram of a third color filter layer according to an embodiment of the disclosure, and as shown in fig. 3c, the color filter layer 202 has a green sub-identification area G and a blue sub-identification area B, where the green sub-identification area G is provided with a green filter carrying green color information, and the blue sub-identification area B is provided with a blue filter carrying blue color information, and an implementation principle thereof is similar to that of the color filter shown in fig. 3a and 3B, and is not repeated here. Fig. 3d is a schematic structural diagram of a fourth color filter layer according to an embodiment of the disclosure, and as shown in fig. 3d, the color filter layer 202 has a red sub-identification area R, a green sub-identification area G, and a blue sub-identification area B, where the red sub-identification area R is provided with a red filter, the green sub-identification area G is provided with a green filter, and the blue sub-identification area B is provided with a blue filter, and an implementation principle thereof is similar to that of the color filters shown in fig. 3a and fig. 3B, and is not repeated herein. Different from the sub-identification areas with only two colors in the color filter layer 202, the color filter 202 with the sub-identification areas with three colors can collect color information of monochromatic light with three different wavelengths, so that the accuracy of the identification image of the finger fingerprint is improved, and the safety performance is further improved. It can be understood that the areas of the sub-identification areas in the color filter layer 202 may be equal or unequal, for example, a red sub-identification area R, a green sub-identification area G, and a blue sub-identification area B are disposed in the color filter layer 202, where the area of the red sub-identification area R is greater than the areas of the green sub-identification area G and the blue sub-identification area B, and the area of the green sub-identification area G may also be greater than the areas of the red sub-identification area R and the blue sub-identification area B, which have the same implementation principle, and are not described herein again.
In some embodiments, the color filter layer 202 further has a hollowed-out area; the optical sensor 201 is also used to collect color information of the light transmitted by the hollow area.
It should be noted that, because the reflection capability of the real finger fingerprint to the blue light is weak, the hollow area can be used to increase the transmittance of the light, so as to prevent the light from being shielded by the color filters with different colors and affecting the function of the optical sensor, thereby improving the precision of the fingerprint identification structure. The light transmittance of the hollowed-out area has a certain relation with the light transmittance of the red sub-identification area R, the green sub-identification area G and the blue sub-identification area B, and specifically, the light transmittance of the hollowed-out area is the sum of the light transmittance of the red sub-identification area R, the green sub-identification area G and the blue sub-identification area B, so that the color information carried by the light passing through the hollowed-out area and the color information carried by the light passing through the red sub-identification area R and the green sub-identification area G can be used for calculating the color information carried by the light passing through the blue sub-identification area B, and the problem that the color information in the optical signal collected by the optical sensor 201 is inaccurate due to the weak reflection capability of the finger fingerprint on the blue light can be avoided.
In some embodiments, the area of the hollowed-out area is greater than or equal to the area of each sub-identification area.
It should be noted that fig. 3e is a schematic structural diagram of a fifth color filter layer according to the embodiment of the disclosure, and as shown in fig. 3e, an area of a hollow area of the color filter layer 202 is larger than an area of each sub-identification area, which can increase transmittance of light and prevent color filters of different colors from shielding light and affecting identification precision. Fig. 3f is a schematic structural diagram of a sixth color filter layer according to an embodiment of the disclosure, and as shown in fig. 3f, an area of a hollow area of the color filter layer 202 is equal to an area of each sub-identification area. It can be understood that the areas of the sub-identification areas and the hollow-out areas of the color filter layer 202 can be set according to actual needs to improve the fingerprint identification precision.
In some embodiments, the hollowed-out area is provided with a filling layer; the material of the filling layer comprises: transparent material or white photoresist.
It should be noted that the hollow area may be provided with a filling layer, and the filling layer may planarize the hollow area, so as to avoid the structure of the hollow area from affecting the adhesion between the color filter layer 202 and other film layers. Specifically, the material of the filling layer may be a transparent material or a white photoresist, and the thickness of the transparent material or the thickness of the white photoresist may be the same as the thickness of the other sub-identification areas of the color filter layer 202.
In some embodiments, the optical sensors 201 each include: a photodiode.
It should be noted that, in practical application, the optical sensor 201 may adopt a photodiode, specifically may be a PN junction or a PIN junction, and may convert an optical signal reflected by a finger fingerprint into an electrical signal to acquire color information of the finger fingerprint, thereby implementing a fingerprint identification function.
Example two
Fig. 4 is a schematic structural diagram of a display module according to an embodiment of the disclosure, and as shown in fig. 4, the display module includes a fingerprint identification structure 103 according to any one of the embodiments; this display module assembly still includes: a display panel 101 and a collimating structure 102; the fingerprint identification structure 103 is located at a side of the display surface facing away from the display panel 101, and the collimating structure 102 is located between the fingerprint identification structure 103 and the display panel 101.
The display panel of the display module 101 provided by the embodiment of the present disclosure may be a self-luminous OLED display panel, in the fingerprint identification structure of the display module, the color filter layer 202 has a plurality of sub-identification areas with different colors, and each sub-identification area is provided with a color filter with a corresponding color, and can filter light reflected by a finger fingerprint into monochromatic light with a corresponding color, for example, a red color filter can filter white light into red light, a green color filter can filter white light into green light, and a blue color filter can filter white light into blue light. The optical sensor 201 can receive monochromatic light formed by filtering through the color filter layer 202, and since the reflection capacities of the finger fingerprints for light with different wavelengths are different and the reflection capacities of different finger fingerprints for the same wavelength are constant, the optical sensor 201 can collect different optical signals carrying various color information and output the collected optical signals so as to form an identification image of the finger fingerprint carrying various color information for the processor. For the false fingerprint manufactured by using the printing method, the optical sensor 201 can only collect black color information in the printed pattern of the false fingerprint to form an identification image carrying only one color information, which is different from the identification image formed by the real fingerprint, so that the function of identifying the fingerprint as a true fingerprint or a false fingerprint can be realized, the fingerprint identification system can have the function of resisting the attack of the false fingerprint, and the security level of the fingerprint identification system can be further improved.
Fig. 5 is a schematic structural view of another display module according to an embodiment of the disclosure, and as shown in fig. 5, the display module includes a fingerprint identification structure 103 according to any one of the embodiments; this display module assembly still includes: a backlight structure 104; the fingerprint identification structure 103 is located at a side close to the light exit surface of the backlight structure 104.
It should be noted that the backlight structure 104 in the display module provided in the embodiment of the present disclosure may provide a light source for a liquid crystal display panel, and the implementation principle of the display module provided in the embodiment of the present disclosure is similar to that of the display module described above, and is not described herein again.
EXAMPLE III
The embodiment of the present disclosure provides a display device, which includes the display module set provided in any of the above embodiments, and the display device may be a mobile phone, a tablet computer, an intelligent watch, a notebook computer, or other terminal devices, and its implementation principle is similar to that of the display module set provided in any of the above embodiments, and is not repeated here.
It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present disclosure, and that the present disclosure is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure, and these are to be considered as the scope of the disclosure.
Claims (10)
1. A fingerprint identification structure, comprising: a plurality of fingerprint identification units arranged in an array; each fingerprint identification unit comprises: the color filter layer is positioned on one side close to the light incident surface of the optical sensor;
the color filter layer is provided with a plurality of sub-identification areas with different colors; each sub-identification area is provided with a color filter with corresponding color and used for filtering light reflected by the fingerprint into light which corresponds to the color of the sub-identification area and carries color information;
the optical sensor is used for collecting optical signals of light carrying color information and outputting the collected optical signals so as to enable the processor to identify the fingerprint as a true fingerprint or a false fingerprint.
2. The fingerprint identification structure of claim 1, wherein the sub-identification zone comprises at least: any two of the red sub-identification area, the green sub-identification area and the blue sub-identification area.
3. The fingerprint identification structure of claim 1, wherein the color filter layer further has a hollowed-out area;
the optical sensor is also used for collecting color information of light transmitted by the hollow area.
4. The fingerprint identification structure of claim 3, wherein the area of the hollowed-out area is greater than or equal to the area of each of the sub-identification areas.
5. The fingerprint identification structure of claim 3, wherein the hollowed-out area is provided with a filling layer; the material of the filling layer comprises: transparent material or white photoresist.
6. The fingerprint recognition structure of claim 1, wherein the optical sensors each comprise: a photodiode.
7. A display module comprising the fingerprint recognition structure of any one of claims 1-6.
8. The display module assembly of claim 7, wherein the display module assembly further comprises: a display panel and a collimating structure;
the fingerprint identification structure is positioned on one side of the display surface which is far away from the display panel;
the collimating structure is located between the fingerprint identification structure and the display panel.
9. The display module assembly of claim 7, wherein the display module assembly further comprises: a backlight structure;
the fingerprint identification structure is positioned on one side of the light-emitting surface close to the backlight structure.
10. A display device comprising a display module according to any one of claims 7 to 9.
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| CN202011324889.0A CN112418093A (en) | 2020-11-23 | 2020-11-23 | Fingerprint identification structure, display module assembly and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112906612A (en) * | 2021-03-05 | 2021-06-04 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| WO2022198681A1 (en) * | 2021-03-26 | 2022-09-29 | 深圳市汇顶科技股份有限公司 | Fingerprint recognition apparatus and electronic device |
-
2020
- 2020-11-23 CN CN202011324889.0A patent/CN112418093A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112906612A (en) * | 2021-03-05 | 2021-06-04 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| CN112906612B (en) * | 2021-03-05 | 2024-02-13 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| WO2022198681A1 (en) * | 2021-03-26 | 2022-09-29 | 深圳市汇顶科技股份有限公司 | Fingerprint recognition apparatus and electronic device |
| US11816920B2 (en) | 2021-03-26 | 2023-11-14 | Shenzhen GOODIX Technology Co., Ltd. | Fingerprint identification apparatus and electronic device |
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