CN108399392B - Fingerprint identification structure and display device - Google Patents
Fingerprint identification structure and display device Download PDFInfo
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- CN108399392B CN108399392B CN201810188447.4A CN201810188447A CN108399392B CN 108399392 B CN108399392 B CN 108399392B CN 201810188447 A CN201810188447 A CN 201810188447A CN 108399392 B CN108399392 B CN 108399392B
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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
- G06V40/1318—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
- G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
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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
- G06V40/1347—Preprocessing; Feature extraction
- G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop
Abstract
The invention provides a fingerprint identification structure. This fingerprint identification structure includes: a light source, a filter, and a photodetector; the light source is used for providing light rays for the fingerprint, and the fingerprint can reflect the light rays; the light filtering device is used for filtering the reflected light rays reflected by the fingerprint, so that the reflected light rays with set angles pass through and are emitted to a set area of the photoelectric detector, and the light filtering device is provided with a light incident surface and a light emitting surface which are oppositely arranged; the photoelectric detector is arranged on the light emergent surface and used for detecting the light intensity distribution of the reflected light passing through the light filtering device and identifying the wave crest and the wave trough of the fingerprint. This fingerprint identification structure can improve fingerprint identification's the degree of accuracy.
Description
Technical Field
The invention belongs to the technical field of fingerprint identification, and particularly relates to a fingerprint identification structure and a display device provided with the fingerprint identification structure.
Background
With the development of fingerprint identification technology, the fingerprint identification technology is widely applied to various fields, such as mobile phones, tablet computers, televisions and the like in electronic equipment terminals; and the door access and the safe in the safety protection system. The implementation mode of fingerprint collection mainly comprises optical technology, capacitance technology, ultrasonic imaging technology and the like, wherein the identification range of the optical fingerprint identification technology is relatively large, and the cost is relatively low.
At present, optical fingerprint recognition technologies used by displays such as Liquid Crystal Displays (LCDs), Organic Light-Emitting diodes (OLEDs), and the like are not mature, and generally, a backlight panel and an optical imaging device are used to perform diffuse reflection fingerprint imaging. However, the transmittance of the display is low, so that the light energy received by photoelectric sensing in the display is low, and light interference exists between the wave trough and the wave crest, so that the fingerprint is difficult to be identified by the detection system, and the accuracy of fingerprint identification is low.
Therefore, it is necessary to research a fingerprint recognition structure and a display device mounted with the fingerprint recognition structure.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The present invention has been made in an effort to overcome the above-described disadvantage of the conventional art that the accuracy of fingerprint recognition is low, and provides a fingerprint recognition structure having high accuracy and a display device having the fingerprint recognition structure mounted thereon.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
According to an aspect of the present disclosure, there is provided a fingerprint identification structure including: a light source, a filter, and a photodetector; wherein the content of the first and second substances,
the light source is used for providing light rays for a fingerprint, and the fingerprint can reflect the light rays;
the light filtering device is used for filtering the reflected light rays reflected by the fingerprint, so that the reflected light rays with set angles pass through and are emitted to a set area of the photoelectric detector, and the light filtering device is provided with a light incident surface and a light emergent surface which are oppositely arranged;
the photoelectric detector is arranged on the light emergent surface and used for detecting the light intensity distribution of the reflected light passing through the light filtering device and identifying the wave crest and the wave trough of the fingerprint.
In an exemplary embodiment of the present disclosure, the optical filtering device includes:
a light blocking body;
the light-transmitting areas are arranged on the light-blocking body in an array mode, and the light-transmitting areas enable the reflected light rays with set angles to pass through the set areas of the photoelectric detector.
In an exemplary embodiment of the present disclosure, the geometric size relationship of the filter device is:
in the formula, W is the aperture of the light-transmitting area, T is the period length of the light-transmitting area, d is the thickness of the light filter, and T is the distance from the fingerprint surface to the light incident surface.
In an exemplary embodiment of the present disclosure, the fingerprint identification structure further includes:
and the light transmission plate is arranged on one side of the light filtering device, which is far away from the photoelectric detector, and is used for conducting total reflection conduction on the light emitted by the light source and guiding out the light by contacting the wave crests of the fingerprint with the light transmission plate.
In an exemplary embodiment of the present disclosure, the light source is disposed on a side surface of the light transmission plate intersecting the light incident surface.
In an exemplary embodiment of the present disclosure, an air gap is disposed between the light transmission plate and the filter device.
In an exemplary embodiment of the present disclosure, the fingerprint identification structure further includes:
and the optical adhesive layer is arranged between the light transmission plate and the light filtering device, and the refractive index of the optical adhesive layer is smaller than that of the light transmission plate.
In an exemplary embodiment of the present disclosure, the light source is an infrared light source or a visible light source, and correspondingly, the photodetector is an infrared photodetector or a visible photodetector.
In an exemplary embodiment of the present disclosure, the fingerprint identification structure further includes:
and the display device is a liquid crystal display or an organic light emitting diode display, the light source is a display device, and the display device is arranged on one side of the optical filter device, which is far away from the photoelectric detector.
According to an aspect of the present disclosure, there is provided a display device including:
the fingerprint identification structure of any one of the above.
According to the technical scheme, the invention has at least one of the following advantages and positive effects:
the fingerprint identification structure comprises a light source, a light filtering device and a photoelectric detector, wherein the light filtering device can filter reflected light rays reflected by a fingerprint, so that the reflected light rays with set angles can pass through and irradiate to a set area of the photoelectric detector. On one hand, the filter can avoid the mutual interference of reflected light between a wave trough and a wave peak, so that the accuracy of fingerprint identification is improved; on the other hand, the light penetrating through the light filtering device can only be emitted to the set area of the photoelectric detector, so that the mutual interference of the reflected light between the wave crest and the wave trough on the photoelectric detector is further avoided, and the accuracy of fingerprint identification is further improved.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
FIG. 1 is a schematic diagram of an exemplary embodiment of a fingerprint identification architecture of the present invention;
FIG. 2 is a schematic diagram of a portion of the structure of the filter device of FIG. 1;
FIG. 3 is a schematic diagram of a fingerprint object field of view of the filter device of FIG. 2;
FIG. 4 is a schematic diagram of a fingerprint image side field of view of the filter device of FIG. 2;
FIG. 5 is a schematic diagram of another exemplary embodiment of a fingerprint identification structure according to the present invention;
fig. 6 is a schematic structural diagram of another exemplary embodiment of the fingerprint identification structure of the present invention.
The reference numerals of the main elements in the figures are explained as follows:
1. a light-transmitting plate; 2. pasting glue on the surface; 3. gluing the frame; 4. a display device;
5. a light filtering device; 51. a light blocking body; 52. a light-transmitting region;
6. a photodetector; 7. a frame; 8. optical cement; 9. an infrared light source; 10. a fingerprint.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
The present invention first provides a fingerprint identification structure, which may include: a light source, a filter device 5, and a photodetector 6, etc.; wherein the light source is used for providing light rays for the fingerprint 10, and the fingerprint 10 can reflect the light rays; the optical filter 5 is configured to filter the reflected light reflected by the fingerprint 10, so that the reflected light with a set angle passes through and is emitted to a set region of the photodetector 6, and the optical filter 5 has a light incident surface and a light emitting surface that are arranged oppositely; the photoelectric detector 6 is arranged on the light emitting surface, and the photoelectric detector 6 is used for detecting the light intensity distribution of the reflected light passing through the light filtering device 5 and identifying the wave crest and the wave trough of the fingerprint 10.
The fingerprint identification structure of the present invention is explained in detail by three exemplary embodiments below.
Example embodiment one:
reference is made to the schematic structural diagram of an exemplary embodiment of the fingerprint identification structure shown in fig. 1.
The fingerprint identification structure may include a photodetector 6, a filter device 5, a display device 4, and the like, which are arranged in sequence from bottom to top.
In the present exemplary embodiment, the photodetector 6 may be a touch sensing glass (sensor glass), that is, the photodetector 6 is disposed on a glass substrate. The photodetector 6 and the filter device 5 can be bonded together by an optical adhesive 8.
In the present exemplary embodiment, the display device 4 may be used as a light source, i.e., the fingerprint 10 may reflect light emitted by the display device 4. The filter device 5 and the display device 4 may be bonded by an optical glue 8. The display device 4 may be a self-luminous display, for example, the display device 4 may be an organic light emitting diode display, for example, may be a micro light emitting diode display (micro led), a micro organic light emitting diode display (micro oled), or the like.
Referring to fig. 2, a partial structural diagram of the filter device 5 is shown.
The filter device 5 may include a light blocking body 51 and a plurality of light transmitting regions 52. A plurality of light-transmitting regions 52 are arranged in the light-blocking body 51 in an array, and the light-transmitting regions 52 allow the reflected light rays with a set angle to pass through and irradiate a set region of the photodetector 6.
In the present exemplary embodiment, the light blocking body 51 is provided in a plate shape and made of a light blocking material. The light-transmitting region 52 is arranged in a cylindrical shape penetrating the light incident surface and the light emitting surface of the filter device 5. The light-transmitting region 52 may be provided with a light-transmitting medium or not, and the light-transmitting purpose is achieved only by providing a through hole on the light-blocking body 51. The plurality of light-transmitting regions 52 are arranged in the light-blocking body 51 in an array according to a set period.
It should be noted that, in this embodiment, the material and the manufacturing method of the optical filter device are not limited too much, and only the functions of the light blocking portion and the light transmitting portion need to be realized.
Since the aperture of the light-transmitting area 52 is small, only the reflected light of a set angle can pass through, and the reflected light of the rest angles is blocked and cannot pass through. Thereby the mutual interference of the reflected light between the wave crest and the wave trough of the fingerprint can be avoided. The distance between the filter device 5 and the photodetector 6 is constant, and the angle of the light passing through the filter device 5 is also constant, so that the light passing through each light-transmitting region 52 can only reach a set region of the photodetector 6, thereby further avoiding the mutual interference of the reflected light between the peaks and the valleys on the photodetector 6.
Refer to the schematic structure diagram of the fingerprint object side field of the filter device 5 shown in fig. 3, and the schematic structure diagram of the fingerprint image side field of the filter device 5 shown in fig. 4. In order to obtain complete fingerprint information and a filter device 5 with a smaller thickness, the size of the object field corresponding to each transparent region 52 of the filter device 5 may be set to be equal to
The image space field size may be:
the geometrical size relationship of the filter device 5 may be:
in the formula, W is the aperture of the light-transmitting area 52, T is the period length of the light-transmitting area 52, d is the thickness of the optical filter 5, T is the distance from the fingerprint surface to the light-incident surface, and h is the distance from the light-emitting surface to a side surface of the photodetector 6 close to the optical filter 5.
The parameter design principle can ensure that the light beam reflected by the finger fingerprint 10 is received by the corresponding position of the photoelectric detector 6, effectively prevents the interference of other fingerprint light beams, and improves the accuracy of fingerprint identification.
Preferably, the above design parameters T are about 900 μm, W is about 10 μm, T is about 50.92 μm, d is about 300 μm, and h is about 50 μm to 100 μm.
Further, the fingerprint identification structure may further include a light transmission plate 1, and the light transmission plate 1 is disposed on a side of the optical filter 5 away from the photodetector 6.
In the present exemplary embodiment, the light transmission plate 1 is a transparent glass plate. The light transmission plate 1 is arranged on the display device 4, and the light transmission plate 1 is bonded with the display device 4 through an optical adhesive 8. The side of the light-transmitting plate 1 remote from the display device 4 is a fingerprint contact surface, i.e. a finger can be pressed against the side of the light-transmitting plate 1 remote from the display device 4.
Further, the fingerprint identification structure may further include a frame 7, and the frame 7 may wrap the sides of the light transmission plate 1, the light source, the optical filter 5, and the photodetector 6, so as to prevent the light transmission plate 1, the light source, the optical filter 5, and the photodetector 6 from being damaged.
Example embodiment two:
fig. 5 is a schematic structural diagram of another exemplary embodiment of the fingerprint identification structure of the present invention.
The main differences between the present exemplary embodiment and the first exemplary embodiment are two points: first, the display device 4 is not used as a light source, but is additionally provided with a special light source; secondly, the light transmission plate 1 plays a different role.
In the present exemplary embodiment, the light source is disposed at a side surface of the light transmission plate 1 intersecting the light incident surface. The light incident surface may be an upper surface of the light transmission plate 1, and the light emitting surface may be a lower surface of the light transmission plate 1, so that a side surface of the light transmission plate 1 intersecting the light incident surface may be a left side surface, a right side surface, a front side surface or a rear side surface of the light transmission plate 1. Thus, the light source can be arranged on the left, right, front or rear side of the light-transmitting plate 1. The light source may be a visible light source or an infrared light source 9. Accordingly, the photodetector 6 may be a visible photodetector or an infrared photodetector. The infrared light source 9 can be an infrared LED light source emitting a near-infrared light beam, and the infrared light source 9 is selected not to influence the normal display of the display device 4 during fingerprint identification because the infrared light is invisible to human eyes.
In this exemplary embodiment, the fingerprint identification structure further includes an optical adhesive layer, the optical adhesive layer is disposed between the light transmission plate 1 and the display device 4, and the optical adhesive layer is a surface adhesive 2, that is, two adjacent surfaces of the light transmission plate 1 and the display device 4 are completely bonded together. The refractive index of the optical cement layer is smaller than that of the light transmission plate 1, and the refractive index of the optical cement layer may be about 1.3, and of course, may also be 1.1, 1.2, and the refractive index of the optical cement layer needs to be matched with that of the light transmission plate 1 as long as the refractive index is smaller than that of the light transmission plate 1.
In the present exemplary embodiment, the light transmission plate 1 is used to conduct light emitted from the light source by total reflection, and the light is guided out by contacting the peaks of the fingerprint 10 with the light transmission plate 1. Light emitted from the light source is incident on the light-transmitting plate 1. Above the light-transmitting plate 1 is air, the refractive index of which is smaller than that of the light-transmitting plate 1; below the light-transmitting plate 1 is an optical glue layer, the refractive index of which is smaller than the refractive index of the light-transmitting plate 1. In this case, the light is totally reflected within the light transmission plate 1 as long as the incident angle of the light is larger than the critical angle.
The peaks of the fingerprint may disrupt the total reflection propagation of the light. After the finger is contacted with the light transmission plate 1, the peak of the fingerprint 10 is contacted with the light transmission plate 1, and the valley of the fingerprint 10 is not contacted with the light transmission plate 1. Because the refractive index of human skin can be about 1.55, the refractive index of the light transmission plate 1 can be about 1.5, and the refractive index of human skin is greater than the refractive index of the light transmission plate 1, after a finger contacts the light transmission plate 1, the peak position of the fingerprint 10 can destroy the requirement of total reflection in the light transmission plate 1, light rays which are irradiated to the light transmission plate 1 and contacted with the peak position of the fingerprint can not generate total reflection but be irradiated to the peak position of the fingerprint 10, and the peak position of the fingerprint 10 can generate reflected light for light reflection.
It should be noted that the refractive index of the light transmission plate 1 may also be 1.7 as long as the incident angle at which total reflection is possible between refractive indices 1.7 and 1.3 is ensured and total reflection is not possible between refractive indices 1.7 and 1.55. If the refractive index of the light transmission plate 1 is 1.5, the difference between the refractive indices 1.5 and 1.3 is too small, so that most incident light does not satisfy the total reflection angle, thereby affecting the energy of the light taken by the fingerprint. In addition, the refractive index of the human body may be smaller than the refractive index of the transmission plate 1, as long as the difference between the refractive indexes of the human skin and the light transmission plate 1 is small, and the total reflection between the medium (light transmission plate) having the refractive index of 1.7 and the medium (adhesive layer) having the refractive index of 1.3, which is originally an angle at which the total reflection occurs, and the medium (skin) having the refractive index of 1.7 and the medium (skin) having the refractive index of 1.55 is broken.
The wave trough of the fingerprint 10 is not contacted with the light transmission plate 1, and the wave trough and the light transmission plate 1 have air, which is equivalent to that the light is incident to the light sparse medium air from the light dense medium glass, the total reflection requirement in the light transmission plate 1 can not be damaged, and therefore, the reflected light can not be generated. Therefore, after the light transmission plate 1 is used, the difference between the reflected light generated at the peak of the fingerprint 10 and the reflected light generated at the valley of the fingerprint 10 is large, the brightness of the light intensity distribution of the reflected light received and identified by the photodetector 6 is obvious, and the peak and the valley of the fingerprint 10 are more easily identified.
Example embodiment three:
fig. 6 is a schematic structural diagram of another exemplary embodiment of the fingerprint identification structure of the present invention.
The main differences between this example embodiment and the second example embodiment are: the optical adhesive layer arranged between the light transmission plate 1 and the light filter 5 is frame adhesive.
In the present exemplary embodiment, the frame paste adheres only to the periphery of the light transmission plate 1 and the optical filter 5, and does not adhere to the middle, and the frame paste has a certain thickness so that an air gap is formed between the light transmission plate 1 and the optical filter 5. The refractive index of air is smaller than that of the light transmission plate 1, and the light is totally reflected within the light transmission plate 1 as long as the incident angle of the light is larger than the critical angle. Wherein all the light entering the light transmission plate 1 from the side will be totally reflected, because the light passing through the side will be refracted and the light of all the incident angles will be larger than the critical angle of total reflection.
The following describes in detail a specific identification process of the third exemplary embodiment:
the light source is an infrared light source. When a finger touches the upper surface of the light transmission plate 1, the refractive index of human skin is about 1.55, which is greater than the refractive index (about 1.5) of the light transmission plate 1, and when light is incident from the light transmission plate 1 to the peak of the fingerprint 10, the light is equivalent to be incident from the optically thinner medium glass to the optically denser medium skin, so that the total reflection of the infrared beam in the light transmission plate 1 is destroyed at the peak of the fingerprint 10, the infrared beam is taken out by the peak of the fingerprint 10 and reflected, and the reflected infrared beam is received by the corresponding position of the photoelectric detector 6 through the display device 4 and the filter device 5. When light is incident to the valleys of the fingerprint 10 from the light transmission plate 1, air is arranged between the valleys of the fingerprint 10 and the light transmission plate 1, namely the light is incident to the light sparse medium air from the optically dense medium glass, so that the total reflection of infrared light beams in the light transmission plate 1 is not damaged at the valleys of the fingerprint 10, no reflected light beam exists, and the difference of reflected light between the peaks and the valleys generated by the reflected light beam is received by the photoelectric detector 6 to identify the light intensity and shade distribution, so that the fingerprint identification is realized.
Furthermore, the invention also provides a display device which comprises the fingerprint identification structure. The specific structure of the fingerprint identification structure has been described in detail above, and is not described herein again.
The fingerprint identification structure comprises a light source, a filter device 5 and a photoelectric detector 6, wherein the filter device 5 can filter reflected light rays reflected by a fingerprint 10, so that the reflected light rays with set angles can pass through and irradiate to a set area of the photoelectric detector 6. On one hand, the filter device 5 can avoid the mutual interference of reflected light between the wave trough and the wave crest of the fingerprint, thereby improving the accuracy of fingerprint identification; on the other hand, the light penetrating through the filter 5 can only be emitted to the set area of the photoelectric detector, so that the mutual interference of the reflected light between the wave crest and the wave trough on the photoelectric detector 6 is further avoided, and the accuracy of fingerprint identification is further improved.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments, and the features discussed in connection with the embodiments are interchangeable, if possible. In the above description, numerous specific details are provided to give a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
The terms "about" and "approximately" as used herein generally mean within 20%, preferably within 10%, and more preferably within 5% of a given value or range. The amounts given herein are approximate, meaning that the meaning of "about", "approximately" or "approximately" may still be implied without specific recitation.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". Other relative terms, such as "top," "bottom," "front," "back," "left," "right," and the like, are also intended to have similar meanings. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
In this specification, the terms "a", "an", "the" and "the" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.
It is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the description. The invention is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications fall within the scope of the present invention. It will be understood that the invention disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute alternative aspects of the present invention. The embodiments described in this specification illustrate the best mode known for carrying out the invention and will enable those skilled in the art to utilize the invention.
Claims (8)
1. A fingerprint identification structure, comprising: a light source, a filter, and a photodetector; wherein the content of the first and second substances,
the light source is used for providing light rays for a fingerprint, and the fingerprint can reflect the light rays;
the light filtering device is used for filtering the reflected light rays reflected by the fingerprint, so that the reflected light rays with set angles pass through and are emitted to a set area of the photoelectric detector, and the light filtering device is provided with a light incident surface and a light emergent surface which are oppositely arranged;
the photoelectric detector is arranged on the light emitting surface and used for detecting the light intensity distribution of the reflected light passing through the light filtering device and identifying the wave crest and the wave trough of the fingerprint;
the optical filter device includes:
a light blocking body;
the light-transmitting areas are arranged on the light-blocking body in an array mode, and enable the reflected light rays with set angles to pass through the set areas of the photoelectric detector;
the geometric size relation of the light filtering device is as follows:
wherein W is the aperture of the transparent region, T is the period length of the transparent region, and the object space view field corresponding to the transparent region has a size of
d is the thickness of the filter, T is the distance from the fingerprint surface to the light incident surface, T is 900 μm, W is 10 μm, T is 50.92 μm, and d is 300 μm.
2. The fingerprint identification structure of claim 1, further comprising:
and the light transmission plate is arranged on one side of the light filtering device, which is far away from the photoelectric detector, and is used for conducting total reflection conduction on the light emitted by the light source and guiding out the light by contacting the wave crests of the fingerprint with the light transmission plate.
3. The fingerprint identification structure of claim 2, wherein the light source is disposed on a side surface of the light transmission plate intersecting the light incident surface.
4. The fingerprint recognition structure of claim 2, wherein an air gap is provided between the light transmission plate and the filter device.
5. The fingerprint identification structure of claim 2, further comprising:
and the optical adhesive layer is arranged between the light transmission plate and the light filtering device, and the refractive index of the optical adhesive layer is smaller than that of the light transmission plate.
6. The fingerprint identification structure of claim 1, wherein the light source is an infrared light source or a visible light source, and correspondingly, the photodetector is an infrared photodetector or a visible photodetector.
7. The fingerprint identification structure of claim 1, further comprising:
and the display device is a liquid crystal display or an organic light emitting diode display, the light source is a display device, and the display device is arranged on one side of the optical filter device, which is far away from the photoelectric detector.
8. A display device, comprising:
the fingerprint recognition structure of any one of claims 1 to 7.
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| CN201810188447.4A CN108399392B (en) | 2018-03-07 | 2018-03-07 | Fingerprint identification structure and display device |
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| CN201810188447.4A CN108399392B (en) | 2018-03-07 | 2018-03-07 | Fingerprint identification structure and display device |
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| CN109271943A (en) * | 2018-09-27 | 2019-01-25 | 联想(北京)有限公司 | A kind of electronic equipment and information processing method |
| CN109886177B (en) * | 2019-02-14 | 2021-08-24 | Oppo广东移动通信有限公司 | Display screen module, electronic equipment and fingerprint image processing method |
| CN110008869B (en) * | 2019-03-25 | 2021-04-30 | 厦门天马微电子有限公司 | Display panel and display device |
| CN110287920B (en) * | 2019-06-29 | 2021-11-19 | 厦门天马微电子有限公司 | Display panel and display device |
| WO2021022425A1 (en) | 2019-08-02 | 2021-02-11 | 深圳市汇顶科技股份有限公司 | Fingerprint detection apparatus and electronic device |
| CN111108511B (en) * | 2019-07-12 | 2023-08-22 | 深圳市汇顶科技股份有限公司 | Fingerprint detection device and electronic equipment |
| CN110781848B (en) * | 2019-10-30 | 2022-05-20 | Oppo广东移动通信有限公司 | Screen fingerprint identification device and electronic equipment |
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