CN109255323B - Fingerprint identification structure, display substrate and display device - Google Patents
Fingerprint identification structure, display substrate and display device Download PDFInfo
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- CN109255323B CN109255323B CN201811026085.5A CN201811026085A CN109255323B CN 109255323 B CN109255323 B CN 109255323B CN 201811026085 A CN201811026085 A CN 201811026085A CN 109255323 B CN109255323 B CN 109255323B
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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
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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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
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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Abstract
The invention provides a fingerprint identification structure, a display substrate and a display device. The fingerprint identification structure comprises a plurality of fingerprint pattern sensors which are arranged in an array, and the fingerprint pattern sensors are used for acquiring fingerprint images; the fingerprint pattern sensor is characterized by further comprising a transparent substrate located on one side of the sensing surface of the fingerprint pattern sensor and a plurality of total reflection lenses located on the transparent substrate, wherein the total reflection lenses are used for enabling at least one part of light rays from one side, close to the fingerprint pattern sensor, of the transparent substrate to be subjected to total reflection and return to one side, close to the fingerprint pattern sensor, of the transparent substrate. According to the fingerprint image generation device, the total reflection lens is arranged, the light can generate the restrained total reflection in the total reflection lens corresponding to the ridge of the fingerprint, the fingerprint image acquired by the fingerprint image sensor only consists of the two signals, the binary image of the fingerprint can be directly generated, the image processing mode is simple, and the possible error is small.
Description
Technical Field
The invention relates to the technical field of fingerprint identification, in particular to a fingerprint identification structure, a display substrate and a display device.
Background
In the existing optical fingerprint identification process, after a fingerprint image is acquired, an acquired initial image needs to be subjected to initial processing such as filtering and the like, and then is further converted into a binary image through binarization processing, and further subsequent processing and feature extraction are performed on the binary image, so that the acquisition and processing processes of the fingerprint are completed.
A binarized image refers to an image that includes only two types of grayscale pixels, where one type of grayscale pixel corresponds to the valleys of a fingerprint and the other type of pixel corresponds to the ridges of a fingerprint. One conventional binarization processing procedure is to use a certain gray value as a threshold, modify the image gray value whose gray value is greater than the threshold to 255, and modify the image gray value whose gray value is less than the threshold to 0, so as to convert the acquired fingerprint image into a binarized image.
Because the acquired initial image is complex, various interference light rays can appear, and the initial image needs to be filtered, the image processing mode is complex, and errors which can appear are large.
Disclosure of Invention
The embodiment of the invention provides a fingerprint identification structure, a display substrate and a display device, and aims to solve the problems that an image processing mode of the existing fingerprint identification structure is complex and errors are large.
In a first aspect, an embodiment of the present invention provides a fingerprint identification structure, including a plurality of fingerprint pattern sensors arranged in an array, where the fingerprint pattern sensors are configured to acquire a fingerprint image;
the fingerprint pattern sensor is characterized by further comprising a transparent substrate positioned on one side of the sensing surface of the fingerprint pattern sensor and a plurality of total reflection lenses positioned on the transparent substrate, wherein the total reflection lenses are used for enabling at least one part of light rays from one side, close to the fingerprint pattern sensor, of the transparent substrate to be subjected to total reflection and return to one side, close to the fingerprint pattern sensor, of the transparent substrate.
Optionally, the refractive index of the material of the total reflection lens is 1.5 to 2.0.
Optionally, the refractive index of the material of the total reflection lens is 1.7 to 2.0.
Optionally, the total reflection lens is hemispherical.
Optionally, the diameter of the total reflection lens is 10 to 100 micrometers.
Optionally, the height of the total reflection lens is 5 to 50 micrometers, where the height of the total reflection lens is a distance between a farthest point of the total reflection lens and the cover plate.
Optionally, the total reflection lenses correspond to the fingerprint pattern sensors one to one.
Optionally, the fingerprint sensor device further comprises a radio frequency fingerprint sensor and/or an ultrasonic fingerprint sensor, wherein the radio frequency fingerprint sensor and/or the ultrasonic fingerprint sensor are arranged on one side of the fingerprint pattern sensor, which faces away from the transparent substrate.
In a second aspect, an embodiment of the present invention further provides a display substrate, including a substrate, a display device formed on the substrate, and a transparent cover plate disposed on the display device, where the transparent cover plate is formed with a plurality of total reflection lenses, and the total reflection lenses are configured to totally reflect at least a part of light from a side of the transparent cover plate close to the display device and return to the side of the transparent cover plate close to the display device.
In a third aspect, an embodiment of the present invention further provides a display device, including a display substrate and the fingerprint identification structure described in any one of the foregoing, where a transparent substrate of the fingerprint identification structure is reused as a transparent cover plate of the display substrate.
In the embodiment of the invention, the total reflection lens is arranged, so that when a fingerprint contacts the total reflection lens, the light can generate restrained total reflection in the total reflection lens corresponding to the ridge of the fingerprint and generate total reflection in the total reflection lens corresponding to the valley of the fingerprint. The fingerprint image collected by the fingerprint image sensor only consists of the two signals, a binary image of the fingerprint can be directly generated, the image processing mode is simple, and possible errors are small.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a fingerprint identification structure according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a fingerprint identification structure according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of another fingerprint identification structure according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of a total reflection lens in an embodiment of the present invention;
FIG. 5 is a diagram illustrating a usage status of a fingerprint identification structure according to a first embodiment of the present invention;
fig. 6 is a schematic structural diagram of a display substrate according to a second embodiment of the present invention;
FIG. 7 is a schematic view of another display substrate according to a second embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display device according to a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of another display device according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment:
the invention provides a fingerprint identification structure.
As shown in fig. 1, in one embodiment, the fingerprint recognition structure includes a fingerprint pattern sensor 101, a transparent substrate 102, and a plurality of total reflection lenses 103 on the transparent substrate 102.
In this embodiment, the fingerprint pattern sensor 101 is used for collecting a fingerprint image, the plurality of fingerprint pattern sensors 101 are arranged in an array, each fingerprint pattern sensor 101 can refer to the fingerprint pattern sensor 101 selected in the existing and improved optical fingerprint identification process, and the specific structure, principle and arrangement mode of the fingerprint pattern sensor 101 are not further limited and described here.
The transparent substrate 102 in this embodiment is located on one side of the sensing surface of the fingerprint pattern sensor 101, and one side of the transparent substrate 102 is provided with a plurality of total reflection lenses 103, as shown in fig. 2, the total reflection lenses 103 in this embodiment may be arranged at intervals, that is, a certain interval is formed between two adjacent total reflection lenses 103, as shown in fig. 3, or may be closely arranged, that is, two adjacent total reflection lenses 103 are abutted.
As shown in fig. 4, fig. 4 is a schematic diagram of the total reflection lens 103, and total reflection refers to a phenomenon that when a light beam is incident from an optically dense medium (i.e., the medium has a large refractive index) to an interface of an optically thinner medium (i.e., the medium has a small refractive index), the light beam is totally reflected back into the original medium. The total reflection lens 103 is a lens that continuously totally reflects light and deflects and returns the light by using the total reflection phenomenon.
As shown in fig. 4, when the total reflection lens 103 is an optically dense medium with respect to air, and the light irradiates the total reflection lens 103 from the direction of the transparent substrate 102, a part of the light is continuously totally reflected multiple times at the interface between the total reflection lens 103 and the air, and returns to the original direction or returns substantially along the original direction.
It should be understood that not all the light rays irradiated to the total reflection lens 103 are totally reflected, for example, as shown in fig. 4, the light rays irradiated to the interface between the total reflection lens 103 and the air in the direction of the incident angle smaller than the critical angle are not totally reflected.
Thus, the total reflection lens 103 totally reflects at least a part of the light from the side of the transparent substrate 102 close to the fingerprint pattern sensor 101 and returns to the side of the transparent substrate 102 close to the fingerprint pattern sensor 101.
As shown in fig. 5, the upper part of fig. 5 represents the fingerprint structure of a part of a finger of a user, and the fingerprint has two features of a valley 201 and a ridge 202, wherein the ridge 202 refers to a convex part of the fingerprint, and the valley 201 refers to a concave part between two adjacent ridges 202.
As shown in FIG. 5, when a fingerprint contacts the transparent substrate 102 during use, the ridge 202 of the fingerprint contacts the total reflection lens 103, and the valley 201 of the fingerprint does not contact the total reflection lens 103.
When light irradiates the total reflection lenses 103 from the direction of the transparent substrate 102, if the position corresponding to one total reflection lens 103 is the valley 201 of the fingerprint, the boundary of the total reflection lens 103 is lens-air, and the light can be totally reflected at the boundary of the total reflection lens 103.
When light irradiates the total reflection lens 103 from the direction of the transparent substrate 102, if the position corresponding to one total reflection lens 103 is the ridge 202 of the fingerprint, the finger abuts against the total reflection lens 103, the boundary of the total reflection lens 103 is changed from lens-air to lens-skin, at this time, the light is subjected to frustrated total reflection at the boundary of the total reflection lens 103, a part of the light is subjected to total reflection, and the other part of the light passes through the total reflection lens 103.
In this way, the light reflected to the fingerprint pattern sensor 101 has only two types, one is the light returning due to total reflection, and the other is the light returning due to frustrated total reflection, and the fingerprint image collected by the fingerprint pattern sensor 101 is composed of only these two types of signals, so that the binary image of the fingerprint can be directly generated, the image processing mode is simple, and the error which may occur is small.
Meanwhile, the detection result in the embodiment has small error, the measurement result is relatively accurate, the requirement on the imaging quality of the fingerprint pattern sensor 101 is relatively low, and the cost is favorably reduced.
Further, the refractive index of the material of the total reflection lens 103 is 1.5 to 2.0.
The formula of the critical angle of total reflection is arcsin (N1/N2), where θ is the critical angle of total reflection, N1 is the refractive index of the optically thinner medium, specifically the refractive index of air in this embodiment, N2 is the refractive index of the optically denser medium, specifically the refractive index of the material of the total reflection lens 103 in this embodiment. In general, the refractive index of air under normal atmospheric pressure is about 1.00029, and the critical angle of the total reflection lens 103 is about 30 degrees to 41.8 degrees by applying the above formula. It should be understood that the higher the refractive index of the material of the total reflection lens 103, the smaller the degree of the critical angle, the more light rays can be totally reflected, and the more accurate the measurement result.
In order to allow more light to be totally reflected, the refractive index of the material of the total reflection lens 103 should be as high as possible within a certain range, and in this embodiment, the refractive index of the material of the total reflection lens 103 may be greater than 1.7. When the refractive index of the material of the total reflection lens 103 is 1.7, the critical angle of the total reflection lens 103 is about 36 degrees.
In one embodiment, the total reflection lens 103 has a hemispherical shape. And the diameter of each total reflection lens 103 is 10 to 100 micrometers. The height of the total reflection lens 103 is 5 to 50 micrometers, wherein the height of the total reflection lens 103 is the distance between the farthest point of the total reflection lens 103 and the cover plate. In the manufacturing process, the total reflection lens 103 structure may be formed on the transparent substrate 102 by means of nano-imprinting or the like.
Further, in order to improve the imaging effect, the total reflection lenses 103 in the present embodiment are disposed in one-to-one correspondence with the fingerprint pattern sensors 101.
Further, as shown in fig. 5, the fingerprint identification structure may further include an rf fingerprint sensor 104A and/or an ultrasonic fingerprint sensor 104B, where the rf fingerprint sensor 104A and/or the ultrasonic fingerprint sensor 104B are disposed on a side of the fingerprint pattern sensor 101 facing away from the transparent substrate 102.
In this embodiment, the RF fingerprint sensor 104A and/or the ultrasonic fingerprint sensor 104B are not used for collecting fingerprint information, but are mainly used for detecting the authenticity of the fingerprint.
It should be understood that the fingerprint pattern sensor 101 identifies fingerprints according to light information, if other structures are attached to the total reflection lens 103, the light may be subjected to frustrated total reflection, and by providing the rf fingerprint sensor 104A and/or the ultrasonic fingerprint sensor 104B, and according to a detection result of the rf fingerprint sensor 104A and/or the ultrasonic fingerprint sensor 104B, it may be determined whether an image identified by the fingerprint pattern sensor 101 is a real fingerprint image.
In the present embodiment, the rf fingerprint sensor 104A and/or the ultrasonic fingerprint sensor 104B may refer to existing and improved rf fingerprint sensors and/or ultrasonic fingerprint sensors, which are not further limited and described herein, and since the rf fingerprint sensor 104A and/or the ultrasonic fingerprint sensor 104B are only used for verifying the authenticity of fingerprint information, the requirement for the detection accuracy thereof is relatively low, which is beneficial for controlling the production cost.
Second embodiment:
the invention also provides a display substrate.
As shown in fig. 6, the display base plate includes a base substrate 601, a display device 602 formed on the base substrate 601, and a transparent cover plate 603 disposed on the display device 602.
In this embodiment, the substrate 601 and the display device 602 of the display substrate may refer to the related components of the existing and improved display substrates, which are not further described and limited herein.
The transparent cover 603 of the display substrate in this embodiment is formed with a plurality of total reflection lenses 103, wherein the total reflection lenses 103 in this embodiment may refer to the total reflection lenses 103 in the above embodiments, and the arrangement manner and principle thereof are not described in detail.
When the display substrate is matched with the fingerprint pattern sensor 101, fingerprint information can be collected through the fingerprint pattern sensor 101, and therefore fingerprint identification under a screen is achieved.
As shown in fig. 6, in this embodiment, the transparent cover 603 may be made of glass or resin, and the total reflection lens 103 structure is formed on the surface of the transparent cover 603
As shown in fig. 7, an additional transparent cover 603 may be disposed on the original glass cover 604 of the display substrate, for example, a transparent cover 603 made of resin or the like is covered on the original glass cover 604 of the display substrate, and the total reflection lens 103 structure is formed on the transparent cover.
Further, it should be understood that, due to the arrangement of the total reflection lens 103, as can be seen from the above analysis process, a part of the light emitted from the display substrate passes through the total reflection lens 103, and a part of the light returns due to total reflection, so that the display substrate can normally display an image, but the total reflection lens 103 may have a certain effect on the display effect of the display substrate.
Further, in order to reduce the influence of the structure of the total reflection lens 103 on the normal display effect of the display substrate, in this embodiment, the light transmission amount can be adjusted by adjusting the distance between two adjacent total reflection lenses 103 or by selecting a material with a suitable refractive index as the material of the total reflection lens 103, so as to reasonably control the ratio of the light penetrating through the total reflection lens 103 to the light totally reflected, thereby balancing the display effect and the fingerprint identification effect.
The third embodiment:
as shown in fig. 8 and 9, the present invention further provides a display device, which includes a display substrate and the fingerprint identification structure of any one of the above embodiments, wherein the fingerprint identification structure can refer to the fingerprint identification structure of the first embodiment, and the display substrate can refer to the display substrate of the second embodiment. In this embodiment, the transparent substrate 102 of the fingerprint identification structure is reused as the transparent cover 603 of the display substrate.
In this embodiment, the transparent cover 603 of the display substrate is formed with the total reflection lens 103, so that the transparent cover 603 of the display substrate is actually the transparent substrate 102 of the fingerprint identification structure. Specifically, reference may be made to the foregoing embodiments, and since the technical solution of the present embodiment includes all technical solutions of the foregoing embodiments, at least all technical effects described above can be achieved, which is not described herein again.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A fingerprint identification structure is characterized by comprising a plurality of fingerprint pattern sensors which are arranged in an array, wherein the fingerprint pattern sensors are used for acquiring fingerprint images;
the fingerprint pattern sensor comprises a fingerprint pattern sensor and is characterized by further comprising a transparent substrate positioned on one side of the sensing surface of the fingerprint pattern sensor and a plurality of total reflection lenses positioned on the transparent substrate, wherein the total reflection lenses are used for enabling at least one part of light rays from one side, close to the fingerprint pattern sensor, of the transparent substrate to be subjected to total reflection and returning to one side, close to the fingerprint pattern sensor, of the transparent substrate;
the total reflection lens is hemispherical, the diameter of the total reflection lens is 10-100 micrometers, the height of the total reflection lens is 5-50 micrometers, the refractive index of a material of the total reflection lens is 1.7-2.0, and the height of the total reflection lens is the distance between the farthest point of the total reflection lens from the transparent substrate and the transparent substrate;
the total reflection lens is used for enabling light rays to be totally reflected at the boundary between the lens and the air in the area corresponding to the valley of the fingerprint, and the total reflection lens is also used for enabling the light rays to be totally reflected in the area corresponding to the ridge of the fingerprint in a restrained mode at the interface between the fingerprint and the skin; the fingerprint pattern sensor is used for collecting the light rays with total reflection and the light rays with restrained total reflection to generate a binary image of the fingerprint;
the total reflection lenses correspond to the fingerprint pattern sensors one by one.
2. The fingerprint identification structure of claim 1, further comprising a radio frequency fingerprint sensor and/or an ultrasonic fingerprint sensor disposed on a side of the fingerprint pattern sensor facing away from the transparent substrate.
3. A display substrate is characterized by comprising a substrate base plate, a display device formed on the substrate base plate and a transparent cover plate arranged on the display device, wherein a plurality of total reflection lenses are formed on the transparent cover plate, and the total reflection lenses are used for enabling at least one part of light rays from one side, close to the display device, of the transparent cover plate to be subjected to total reflection and return to one side, close to the display device, of the transparent cover plate;
the total reflection lens is hemispherical, the diameter of the total reflection lens is 10-100 micrometers, the height of the total reflection lens is 5-50 micrometers, the refractive index of a material of the total reflection lens is 1.7-2.0, and the height of the total reflection lens is the distance between the farthest point of the total reflection lens from the transparent cover plate and the transparent cover plate;
the total reflection lens is used for enabling light rays to be totally reflected at the boundary between the lens and the air in the area corresponding to the valley of the fingerprint, and the total reflection lens is also used for enabling the light rays to be totally reflected in the area corresponding to the ridge of the fingerprint in a restrained mode at the interface between the fingerprint and the skin; the fingerprint pattern sensor is used for collecting the light rays with total reflection and the light rays with restrained total reflection to generate a binary map of the fingerprint;
the total reflection lenses correspond to the fingerprint pattern sensors one by one.
4. A display device comprising a display substrate and the fingerprint recognition structure of any one of claims 1 to 2, wherein the transparent base of the fingerprint recognition structure is reused as a transparent cover for the display substrate.
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| CN201811026085.5A CN109255323B (en) | 2018-09-04 | 2018-09-04 | Fingerprint identification structure, display substrate and display device |
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| CN201811026085.5A CN109255323B (en) | 2018-09-04 | 2018-09-04 | Fingerprint identification structure, display substrate and display device |
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