KR20220000736U - Optical fingerprint recognition device, optical fingerprint recognition method and touch terminal - Google Patents

Abstract

The present disclosure provides an optical fingerprint recognition apparatus, an optical fingerprint recognition method, and a touch terminal, and relates to a technical field of a display terminal. The optical fingerprint recognition device includes a microlens layer, at least one diaphragm layer and a photosensitive sensor array from one side adjacent to the OLED display element in order from top to bottom, wherein the microlens layer includes a plurality of microlenses, , wherein the diaphragm layer includes a plurality of diaphragm holes, the photosensitive sensor array includes a plurality of photosensitive sensor units, the microlenses correspond to the diaphragm 1:1, and each microlens has one photosensitive sensor Corresponding arrays, the optical signal reflected by the finger, coming from the direction of the OLED display element, passes through the microlens and again through the diaphragm of the at least one diaphragm layer and is received by the photosensitive sensor unit. In the optical fingerprint recognition device, the optical fingerprint recognition method and the touch terminal provided in the present disclosure, by limiting the light reception angle of the light signal reflected through the aperture hole, the optical crosstalk of the photosensitive sensor unit can be prevented, and the imaging effect of the optical imaging structure can improve

Description

Optical fingerprint recognition device, optical fingerprint recognition method and touch terminal

The present disclosure relates to the field of display terminals, in particular, an optical fingerprint recognition device, an optical fingerprint recognition method, and a touch terminal.

Full-screen (full-screen) is currently the main component of mobile phones, and due to the use of full-screen mobile phones, fingerprints under the organic light-emitting diode (OLED) screen has become a research direction of much interest.

In current products, an optical lens structure is mostly used as an optical imaging structure of a full screen, and in order to satisfy the requirements of the lens structure and the light path, all corresponding optical lenses are provided above the photosensitive sensor array. The distance between the plurality of optical lenses is relatively close, and crosstalk between light rays is very easy to occur, which affects the imaging effect of the optical imaging structure.

In view of this, an object of the present disclosure is to provide an optical fingerprint recognition device and a touch terminal in order to alleviate technical problems such as crosstalk in the prior art.

An embodiment of the present disclosure provides an optical fingerprint recognition device. the optical fingerprint recognition device is installed under the OLED display element, and sequentially includes a microlens layer, at least one diaphragm layer, and a photosensitive sensor array from one side adjacent to the OLED display element from top to bottom; the microlens layer includes a plurality of microlenses, the aperture layer includes a plurality of aperture holes, and the photosensitive sensor array includes a plurality of photosensitive sensor units; The microlenses correspond 1:1 with the aperture hole, and one photosensitive sensor unit corresponds to each microlens; The light signal reflected by the finger, coming from the direction of the OLED display element, passes through the microlens and again through the diaphragm hole of the at least one diaphragm layer and is received by the photosensitive sensor unit.

In an embodiment, the optical fingerprint recognition device further includes an infrared filter layer installed between the microlens layer and the photosensitive sensor array.

In one embodiment, the diaphragm layer includes a first diaphragm layer and a second diaphragm layer as two layers, and the aperture of the diaphragm hole of the first diaphragm layer adjacent to the microlens layer side is a second diaphragm adjacent to the photosensitive sensor array side. larger than the aperture of the aperture hole of the floor; The aperture of each stop hole of the first stop layer is the same, and the aperture of each aperture hole of the second stop layer is the same.

In one embodiment, the optical fingerprint recognition device further comprises a first transparent intervening layer and a second transparent intervening layer; The microlens layer, the first transparent intervening layer, the first diaphragm layer, the second transparent intervening layer, the infrared filter layer, and the second diaphragm layer are disposed in this order.

In one embodiment, the thickness of the first stop layer is between 0.8 μm and 3 μm; the thickness of the second stop layer is also 0.8 μm to 3 μm; the aperture of the stop hole of the first stop layer is 5 μm to 15 μm, and the aperture of the aperture hole of the second stop layer is 1.5 μm to 8 μm; the spacing between the first and second diaphragm layers is between 5 μm and 20 μm; the thickness of the first transparent intervening layer is 5 μm to 20 μm; The thickness of the infrared filter layer is between 5 μm and 8 μm.

In one embodiment, the optical fingerprint recognition device further comprises a buffer layer provided between the infrared filter layer and the second stop layer; The buffer layer is a silicon oxide layer or a silicon nitride layer.

In one embodiment, the optical fingerprint recognition device further includes a color filter film layer disposed between the microlens layer and the photosensitive sensor array.

In one embodiment, the color filter film layer is provided adjacent to the microlens layer.

In one embodiment, the thickness of the color filter film layer is 0.6 μm to 2 μm.

In one embodiment, the diaphragm layer comprises a third diaphragm layer adjacent to the microlens layer side, a fifth diaphragm layer close to the photosensitive sensor array side and at least one metal diaphragm layer provided between the photosensitive sensor array and the fifth diaphragm layer and; The apertures of the stop holes on the third stop layer, the fifth stop layer, and the at least one metal stop layer decrease sequentially from top to bottom.

In one embodiment, the diaphragm layer further comprises a fourth diaphragm layer provided between the third diaphragm layer and the fifth diaphragm layer.

In one embodiment, the infrared filter layer is provided between the metal diaphragm layer and the fifth diaphragm layer.

In one embodiment, the device further comprises a transparent protective layer disposed between the metal stop layer and the infrared filter layer.

In one embodiment, the device comprises a third transparent intervening layer provided between the third and fourth diaphragm layers, a fourth transparent intervening layer provided between the fourth and fifth diaphragm layers, a third diaphragm layer and a fifth transparent interposition layer and a sixth transparent intervening layer which are sequentially installed from top to bottom between the microlens layer; The sixth transparent intervening layer is a flat intervening layer.

In one embodiment, the aperture range of each aperture hole of the third aperture layer may be 8 μm to 20 μm, the aperture range of each aperture hole of the fourth aperture layer may be 6 μm to 10 μm, and the fifth aperture layer The aperture of each aperture of the diaphragm may be 6 μm to 7 μm, and the aperture of each aperture hole of the metal aperture layer may be 1.5 μm to 4 μm.

An embodiment of the present disclosure provides a touch terminal including an OLED display device and the optical fingerprint recognition device of the first aspect described above, wherein the optical fingerprint device is mounted under the OLED display device.

An embodiment of the present disclosure provides an optical fingerprint recognition method applied to the above-described optical fingerprint recognition apparatus, the optical fingerprint recognition method comprising:

controlling the OLED display element to emit an optical signal, the optical signal being reflected by a finger above the OLED display element to obtain reflected light;

transmitting the reflected light through each microlens of the microlens layer and irradiating the at least one stopper layer toward a hole of each aperture corresponding to each microlens; and

and generating, by a photosensitive sensor unit on a photosensitive sensor array, a fingerprint photosensitive signal for fingerprint recognition by receiving the reflected light passing through a corresponding aperture hole.

According to the embodiment of the present disclosure, the following effects occur:

According to the optical fingerprint recognition device, the optical fingerprint recognition method, and the touch terminal provided in the embodiments of the present disclosure, the optical fingerprint recognition device may be installed below the OLED display device, and from one side adjacent to the OLED display device, the optical fingerprint recognition device may comprise a microlens layer, at least one diaphragm layer and a photosensitive sensor array, in order from top to bottom; The microlens layer includes a plurality of microlenses, the diaphragm layer includes a plurality of aperture holes, the photosensitive sensor array includes a plurality of photosensitive sensor units, the microlenses and the aperture holes correspond one-to-one, and each microlens corresponds to one above-described photosensitive sensor unit. Thereby, the light signal reflected by the finger, coming from the OLED display element direction, passes through the microlens and then again passes through the aperture hole of the at least one aperture layer, so that the light reception angle of the reflected light signal can be limited by the aperture hole. and the angle of the reflected light signal is limited within a very small angle range above it, thereby reducing the optical crosstalk phenomenon when the reflected light signal is received by the photosensitive sensor unit, thereby improving the imaging effect of the optical imaging structure.

Other features and advantages of the present disclosure will be set forth in the specification that follows, and in part will be clearly understood by the specification or may be understood by practicing the disclosure. The objects and other advantages of the present disclosure will be realized by the structure particularly shown in the specification, claims and accompanying drawings.

A comparatively preferred embodiment will be described in detail below with reference to the accompanying drawings so that the above objects, features, and advantages of the present disclosure may be more clearly understood.

In order to more clearly describe a specific embodiment of the present disclosure or a technical solution method in the prior art, the drawings necessary for the description of the specific embodiment or the prior art are briefly introduced below. The drawings described below are some embodiments of the present disclosure, and it goes without saying that those skilled in the art may derive other drawings based on these drawings without creative efforts.
1 is a schematic structural diagram of an optical fingerprint recognition device provided by an embodiment of the present disclosure.
2 is a schematic ray propagation diagram of an optical fingerprint recognition device provided by an embodiment of the present disclosure.
3 is a schematic structural diagram of another optical fingerprint recognition device provided by an embodiment of the present disclosure.
4 is a schematic structural diagram of another optical fingerprint recognition device provided by an embodiment of the present disclosure.
5 is a schematic structural diagram of another optical fingerprint recognition device provided by an embodiment of the present disclosure.
6 is a schematic structural diagram of another optical fingerprint recognition device provided by an embodiment of the present disclosure.
7 is a schematic flowchart of an optical fingerprint recognition method provided by an embodiment of the present disclosure.

In order to make the object, technical solution method and advantage of the embodiment of the present disclosure more clear, the technical solution method of the present disclosure will be clearly and completely described below with reference to the drawings. However, the described embodiments are only some embodiments of the present disclosure, and of course not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without creative efforts fall within the protection scope of the present disclosure.

Most of the existing optical imaging structures use an optical lens structure, such as an OLED display element, and the majority of the optical lens structures are microlens structures. It is required to dispose the corresponding microlenses above all the photosensitive sensor units in the array. Although this method satisfies the demands for the structure and optical path of the microlens, optical crosstalk may occur in the reflected light received by the photosensitive sensor unit during the imaging process.

Based on this, the optical fingerprint recognition device and the touch terminal provided by the embodiments of the present disclosure can effectively alleviate the above-described problems.

For a convenient understanding of the present embodiment, the optical fingerprint recognition device disclosed in the embodiment of the present disclosure will be described in detail first.

In one embodiment, the embodiment of the present disclosure provides an optical fingerprint recognition device, specifically, the optical fingerprint recognition device provided by the embodiment of the present disclosure is installed under the OLED display element, and adjacent to the OLED display element from one side, a microlens layer, at least one diaphragm layer, and a photosensitive sensor array, in order from top to bottom.

Specifically, in the schematic structural diagram of the optical fingerprint recognition device shown in FIG. 1 , the microlens layer 20 , the diaphragm layer 30 , and the photosensitive sensor array layer 40 are sequentially illustrated from top to bottom. In addition, for convenience of explanation, only two diaphragm layers 30 are illustrated in FIG. 1 by way of example, but in another embodiment, the number of diaphragm layers may be changed, and specifically, based on the actual use situation, , which is not limited by the embodiments of the present disclosure.

In the optical fingerprint recognition device shown in FIG. 1 , the microlens layer 20 includes a plurality of micro lenses 202 , the aperture layer 30 includes a plurality of aperture holes 302 , and the photosensitive sensor array includes: a plurality of photosensitive sensor units (PD); The micro lens and the aperture hole correspond 1:1; One photosensitive sensor unit PD corresponds to each microlens, and each microlens in the embodiment shown in FIG. 1 corresponds to a photosensitive sensor unit PD 1:1.

The light signal reflected by the finger, coming from the direction of the OLED display element, passes through the micro lens and then again through the aperture hole of the at least one stop layer, and is received by the photosensitive sensor unit.

For convenience of understanding, FIG. 2 shows a schematic light propagation diagram of an optical fingerprint recognition device, and the OLED display device of FIG. 2 is entirely a glass cover plate, a transparent optical adhesive layer, a polarizing layer, a touch layer, a display film layer and a base. The layers are included in order from top to bottom, and when the OLED is turned on, the luminous intensity displayed by the OLED irradiates the valleys and ridges of the finger. Since the valley part is the interface between the glass cover plate and the air, and the ridge part is the epidermis of the finger, the valley has a greater luminosity compared to the ridgeline. In order to explain that the optical fingerprint recognition device can distinguish the positions of the valleys and the ridges, the valleys and the ridges have positions where they reflect light, respectively, black light (solid line) is reflected light at a small angle, and dotted lines are different It is assumed to represent the light of an angle. From the structure shown in FIG. 2, it is confirmed that near-vertical light is condensed by the microlens after passing through the OLED display device, passes through the aperture hole of the aperture layer, reaches the photosensitive sensor array, and is converted into a corresponding electrical signal and read. Able to know. Light from different angles is condensed by the microlens, but all are blocked by the diaphragm layer, and only absorbed by the black material of the diaphragm, but cannot pass through the diaphragm hole. As described above, only light at a small angle from the valley or ridge reaches the photosensitive sensor unit PD, so that the light reflected from the valley is received by the photosensitive sensor unit PD below the corresponding valley, and the light reflected from the ridge While received by the photosensitive sensor unit PD below the corresponding ridge line, all other light signals prone to light mixing or crosstalk are blocked by the diaphragm layer. This allows the valleys and ridges to be distinguished. That is, the optical fingerprint recognition device provided in the embodiment of the present disclosure reduces mutual interference between optical paths of the microlens by providing an aperture layer below the microlens layer, thereby improving the overall reliability of the optical fingerprint recognition device.

Therefore, in the case of the optical fingerprint recognition device provided in the embodiment of the present disclosure, the optical fingerprint recognition device may be installed under the OLED display element, and from one side adjacent to the OLED display element, the optical fingerprint recognition device may include a microlens layer, at least one diaphragm layer and a photosensitive sensor array, in order from top to bottom; The microlens layer includes a plurality of microlenses, the diaphragm layer includes a plurality of aperture holes, the photosensitive sensor array includes a plurality of photosensitive sensor units, the microlenses and the aperture holes correspond one-to-one, and each microlens corresponds to one above-described photosensitive sensor unit. Thereby, the light signal reflected by the finger, coming from the direction of the OLED display element, passes through the microlens and then again passes through the diaphragm hole of at least one diaphragm layer, so that the light reception angle of the reflected light signal can be limited by the diaphragm hole. and the angle of the reflected light signal is limited within a very small angle range above it, thereby reducing the optical crosstalk phenomenon when the reflected light signal is received by the photosensitive sensor unit, thereby improving the imaging effect of the optical imaging structure.

1 and 2, in order to implement 1:1 correspondence between the microlens and the diaphragm hole in the embodiment of the present disclosure, in general, the center of the microlens is installed to be aligned with the center of the diaphragm hole, and the number of elements is increased. In order to reduce and reduce manufacturing cost, a plurality of photosensitive sensor units included in the photosensitive sensor array are generally installed at the lower end of the aperture hole, and the lowermost aperture layer is adjacent to the photosensitive sensor unit of the photosensitive sensor array, for example, a photosensitive sensor array. It can be seen that it can be directly covered. That is, in such a way that the photosensitive sensor unit PD of FIGS. 1 and 2 is installed at a corresponding position under the diaphragm hole, the light receiving portion of the photosensitive sensor unit PD is aligned with the diaphragm hole and receives the light signal reflected by the finger. can receive

In order to avoid the effect of infrared rays on fingerprint imaging, the optical fingerprint recognition device provided in the embodiment of the present disclosure filters infrared rays and excludes infrared rays influence on fingerprint imaging. It further includes a filter layer. Based on this, based on FIG. 1, FIG. 3 shows a schematic structure of another optical fingerprint recognition device. In FIG. 3, the optical fingerprint recognition device includes two diaphragm layers. A case will be described as an example. The two diaphragm layers are merely exemplary, and in other embodiments, the number of diaphragm layers may vary, specifically based on actual use situations, and embodiments of the present disclosure are not limited thereto. An infrared filter layer 50 for filtering infrared rays passing through the microlens is provided between the two diaphragm layers. In addition, FIG. 3 further includes a base layer 80, wherein the photosensitive sensor array described above is generally It is installed on the base layer 80 , and as shown in FIG. 3 , a plurality of photosensitive sensor units PD are installed on the base layer 80 .

Specifically, as shown in FIG. 3 , in the case of the embodiment having two diaphragm layers, the diaphragm layer adjacent to one side of the microlens layer is generally the first diaphragm layer, and the diaphragm layer adjacent to one side of the photosensitive sensor array. This second diaphragm layer. That is, it is the first stop layer 303 and the second stop layer 304 of FIG. 3 . In addition, the aperture of the stop hole of the first stop layer 303 adjacent to the microlens layer side is larger than the aperture of the aperture hole of the second aperture layer 304 adjacent to the photosensitive sensor array side, so that the optical signal passing through the first aperture layer has an aperture. It is convenient to further limit the light receiving angle, and the problem of causing optical crosstalk by the optical signal passing through the adjacent microlens reaching the same PD can be effectively avoided.

Also, in the case of an embodiment in which there are multiple diaphragm layers, the apertures of diaphragm holes included in each diaphragm layer may be set to have the same size. That is, the aperture of each stop hole of the above-described first stop layer may be the same, and the aperture of each aperture hole of the second stop layer may also be the same. 3 is an embodiment in which the size of the diaphragm hole in each diaphragm layer is the same, and in another embodiment, a plurality of diaphragm holes included in each diaphragm layer are arranged with apertures of different sizes according to the actual use situation so that the optical signal The need for reception may be satisfied, and specifically, it may be installed according to an actual use situation, and the embodiment of the present disclosure is not limited thereto.

3 is an embodiment in which an infrared filter layer is installed between two diaphragm layers, and in another embodiment, the infrared filter layer may be located above the first diaphragm layer, or below the second diaphragm layer. may be located. Similarly, by filtering the light signal reaching the photosensitive sensor unit PD, the effect of infrared light on fingerprint imaging may be excluded, and the specific installation method may be continued according to the actual use situation, the embodiment of the present disclosure does not limit this.

As shown in FIG. 3 , the optical fingerprint recognition device provided in the embodiment of the present disclosure further includes a first transparent interposition layer 60 and a second transparent intervening layer 70 ; The aforementioned microlens layer 20 , the first transparent intervening layer 60 , the first diaphragm layer 303 , the second transparent intervening layer 70 , the infrared filter layer 50 , and the second diaphragm layer 304 are The base layer 80 which is sequentially disposed and includes a plurality of photosensitive sensor units PD is provided below the second stop layer 304 .

Specifically, in FIG. 3 , the thickness range of the first stop layer may be 0.8 μm to 3 μm; The thickness of the second stop layer may also range from 0.8 μm to 3 μm; The aperture range of the stop hole of the first stop layer may be 5 μm to 15 μm and the aperture range of the aperture hole of the second stop layer may be 1.5 μm to 8 μm. That is, the aperture of the diaphragm hole of the first diaphragm layer is surely larger than that of the diaphragm hole of the second diaphragm layer. The aforementioned first diaphragm layer and the second diaphragm layer may have a range of 5 μm to 20 μm; The thickness range of the first transparent intervening layer may be 5 μm to 20 μm; The thickness range of the infrared filter layer may be 5 μm to 8 μm, the height range of the aforementioned microlenses is generally 2 μm to 3 μm, and the diameter of the microlenses may be 10 μm to 20 μm, and the above-mentioned parameters The crosstalk problem between the lights can be solved by limiting the light receiving angle through the combination of , and avoiding the light passing through the adjacent microlenses from reaching the same photosensitive sensor unit PD. As a selectable embodiment based on the above-described parameter range, it may be implemented in a specific manner as shown in Table 1 below.

film layer thickness height of microlens 3.0 μm diameter of microlens 12.5 μm first transparent intervening layer 8.2 μm thickness of the first stop layer 1.3 μm Aperture of the aperture hole of the first aperture layer 5.0 μm Aperture of the aperture hole of the second aperture layer 1.75 μm thickness of the infrared filtering layer 6.3 μm thickness of the second stop layer 1.0 μm gap between the first and second diaphragm layers 8.2 μm

At this time, the thickness of the above-described second transparent intervening layer is adjusted to the interval between the first and second diaphragm layers in Table 1 so that the gap between the first diaphragm layer and the second diaphragm layer satisfies the design needs. can be set accordingly.

In a specific implementation, each of the layer structures shown in FIG. 3 may be grown in such a way that all of them are formed layer by layer on the base layer 80 including the photosensitive sensor unit PD, or correspond to each layer described above. The optical fingerprint recognition device shown in FIG. 3 may be formed by separately manufacturing the optical layer structure and then assembling it. A specific production process may be set according to an actual use situation, and the embodiment of the present disclosure is not limited thereto.

In practical use, considering that the coating process of the infrared filter layer has a relatively high requirement for the flatness of the substrate, a relatively flat buffer layer may be provided before coating of the infrared filter layer so as to be convenient for the growth of the infrared filter layer. Accordingly, the optical fingerprint recognition device may further include a buffer layer provided between the infrared filter layer and the second diaphragm layer; Specifically, based on FIG. 3 , FIG. 4 also shows a schematic structural diagram of another optical fingerprint recognition device, which further includes a buffer layer 90 in addition to the structure shown in FIG. 3 .

The buffer layer 90 is generally a silicon oxide layer or a silicon nitride layer, which is convenient for installing a relatively flat plane on the second stop layer 304, and for growing the infrared filter layer 50, It is also advantageous for protection of the second stop layer 304 .

The optical fingerprint recognition device provided in the embodiment of the present disclosure further includes a color filter film layer installed between the microlens layer and the photosensitive sensor array. The color filter film layer is installed adjacent to the microlens layer, and color filter (CF) films such as red, green, and blue filter films are formed at positions of pixels corresponding to each photosensitive sensor unit in the photosensitive sensor array. It is convenient to add, and realizes biometric fingerprint detection by collecting optical signals of a specific spectrum to determine whether a fingerprint image is generated from a real finger or a virtual finger. Specifically, the color filter film layer 91 is shown in the embodiment shown in FIG. 4 , and the thickness range of the color filter film layer 91 may be 0.6 μm to 2 μm, and the In the optical fingerprint recognition device, the color filter film layer 91 is installed below the microlens layer 20, that is, between the microlens layer 20 and the first transparent intervening layer 60, to transmit an optical signal of a specific spectrum. Convenient to collect and filter.

Through the optical fingerprint recognition device shown in FIG. 4, the light receiving angle of the photosensitive sensor unit can be limited to around ±4°, preferably within ±1.5°, and a plurality of diaphragm layers are provided with a microlens layer adjacent to each other. It is possible to solve the problem of optical crosstalk caused by the optical signal passing through the optical signal reaching the photosensitive sensor unit, and effectively improve the overall reliability of the optical fingerprint recognition device.

In addition to the embodiment of the two light blocking layers shown in FIG. 3 or 4, based on FIG. 1, FIG. 5 also shows a schematic structural diagram of another optical fingerprint recognition device. 5, the diaphragm layer of the optical fingerprint recognition device comprises: a third diaphragm layer adjacent to the microlens layer side, a fifth diaphragm layer adjacent to the photosensitive sensor array side, and between the photosensitive sensor array and the fifth diaphragm layer installed at least one metal stop layer. That is, the diaphragm layers included in the optical fingerprint recognition device shown in FIG. 5 are: a third diaphragm layer 306 , a fifth diaphragm layer 308 , and a metal diaphragm layer 309 , and for convenience of explanation, FIG. 5 . Only the metal stop layer 309 is shown. Further, in order to achieve a better light path effect, as shown in FIG. 5 , the aperture hole apertures on the third stop layer 306 , the fifth stop layer 308 and the at least one metal stop layer are from top to bottom. decreases sequentially.

In a specific implementation, the above-described at least one metal stop layer may be installed in the form of the first to third layers, but only one metal stop layer is exemplarily shown in FIG. 5 , and the metal stop layer is light-sensitive. It can directly cover the sensor array. Specifically, the aperture of the aperture hole of the metal stop layer may be 1.5 μm to 4 μm, and crosstalk between light transmitted to the photosensitive sensor array can be further reduced.

In addition to the embodiment comprising the two diaphragm layers, the optical fingerprint recognition device may comprise a fourth diaphragm layer. Specifically, in the optical fingerprint recognition device shown in FIG. 5 , the diaphragm layer may further include a fourth diaphragm layer 307 provided between the third diaphragm layer 306 and the fifth diaphragm layer 308 . At this time, the optical fingerprint recognition device includes three diaphragm layers: a third diaphragm layer 306 , a fourth diaphragm layer 307 and a fifth diaphragm layer 308 . In order to achieve a better light path effect, as shown in FIG. 5 , the apertures of the stop holes on the third stop layer 306 , the fourth stop layer 307 and the fifth stop layer 308 are from top to bottom. decreases sequentially, and a metal material or other material may be used for the three diaphragm layers.

At this time, in the optical fingerprint recognition device shown in FIG. 5 , a third stop layer 306 , a fourth stop layer 307 , a fifth stop layer 308 , and a metal stop layer 309 are sequentially arranged from top to bottom. , the aperture of the aperture hole of each layer described above decreases in turn, and in other embodiments, the number of metal stop layers and the manner of installation of the fourth aperture layer and the at least one metal stop layer depend on the actual use situation. may be set, and the embodiment of the present disclosure is not limited thereto.

In the embodiment in which the aforementioned infrared filter layer is provided, the aforementioned infrared filter layer 50 of FIG. 5 is provided between the metal stop layer 309 and the fifth stop layer 308 .

In actual use, the optical fingerprint recognition device further includes a transparent protective layer 305 provided between the metal stop layer 309 and the infrared filter layer 50 (see FIG. 6 ). The transparent protective layer 305 may be a silicon oxide layer or a silicon nitride layer, and is generally located on the upper surface of the metal stop layer, and may form a relatively flat plane on the upper surface of the metal stop layer. In the case of the structure in which the infrared filter layer is formed, the flat plane provided by the transparent protective layer 305 is advantageous for coating the infrared filter layer, and the infrared filter layer is convenient for deposition and growth in the transparent protective layer, and protects the metal diaphragm layer You may.

5 to 6, the optical fingerprint recognition device shown in FIGS. 5 to 6 includes a third transparent intervening layer 310 provided between the third diaphragm layer 306 and the fourth diaphragm layer 307; A fourth transparent intervening layer 311 provided between the fourth diaphragm layer 307 and the fifth diaphragm layer 308, and a fifth transparent intervening layer provided between the third diaphragm layer 306 and the microlens layer from top to bottom It further includes a 312 and a sixth transparent intervening layer 313 , wherein the sixth transparent intervening layer 313 is a flat intervening layer. That is, the upper portion of each diaphragm layer is covered by a planar interposition layer, the uppermost transparent intervening layer further includes a planar interposition layer, and the microlens layer 20 is provided on the planar intervening layer.

In a specific implementation, the aperture range of each aperture hole of the above-described third stop layer may be 8 μm to 20 μm, the aperture range of each aperture hole of the fourth aperture layer may be 6 μm to 10 μm, and the fifth aperture layer The aperture range of each aperture hole of , may be 6 μm to 7 μm, and the aperture range of each aperture hole of the metal aperture layer may be 1.5 μm to 4 μm. Therefore, in the case of an optical fingerprint recognition device including three diaphragm layers, diaphragm holes are all provided on each diaphragm layer, and the apertures of different diaphragm layers gradually increase from bottom to top.

In the above-described embodiment, the center of the plurality of microlenses included in the microlens layer may be vertically aligned with the center of the corresponding aperture of each diaphragm layer and the center of the corresponding photosensitive sensor unit, and light is received by the structure described above. The light-receiving angle of the photosensitive sensor unit can be adjusted within ±4°, for example, in the case of a metal diaphragm layer, an aperture of 2 μm corresponds to ±1.5°, an aperture of 4 μm corresponds to ±4°, and multiple layers The diaphragm layer installed as a diaphragm prevents the light signal passing through the adjacent microlens from reaching the same photosensitive sensor unit, effectively preventing the crosstalk problem between the lights.

As the base layer 80 of FIG. 5 , a silicon base layer may be generally used, and a silicon-based photosensitive sensor array is formed together with the photosensitive sensor array. The silicon-based photosensitive sensor array has a photosensitive area, and a plurality of photosensitive sensor units included in the photosensitive sensor array may be distributed in an array form on the photosensitive area, and in this embodiment, one photosensitive sensor unit ( PD), but not all photosensitive sensor arrays have a corresponding microlens. For example, the photosensitive sensor unit of FIG. 5 includes a PD corresponding to a microlens, and also includes a PD without a corresponding microlens; In the case of a PD that does not have a corresponding microlens, fingerprint imaging is not performed by receiving light from the microlens, and other functions can be implemented by receiving other light or in an idle state. A light signal reflected from the surface can be detected.

Based on the above-described embodiment, an embodiment of the present disclosure further provides a touch terminal, and the touch terminal may be a touch terminal such as a mobile phone or a tablet PC, and is specially applied to a full screen mobile phone. The touch terminal includes an OLED display element and an optical fingerprint recognition device provided in any of the above embodiments, wherein the optical fingerprint recognition device is installed under the OLED display element, and they can be fixed with a frame-mounted gasket, the The middle is filled with air or a low refractive index material.

Accordingly, since the touch terminal provided in the embodiment of the present disclosure includes all the technical features of the optical fingerprint recognition device provided in the above-described embodiment, it is possible to solve the same technical problem and achieve the same technical effect. For the convenience and conciseness of the description, it is apparent to those skilled in the art that a corresponding process among the above-described method embodiments may be referred to with respect to a specific operation process of the touch terminal, and thus a repetitive description will be omitted.

7 , an embodiment of the present disclosure includes an optical fingerprint recognition method applied to the above-described optical fingerprint recognition apparatus, the method comprising:

Step S101: controlling the OLED display element to emit an optical signal, the optical signal being reflected by a finger above the OLED display element to obtain reflected light;

Step 102: transmitting the reflected light through each microlens of the microlens layer and irradiating the reflected light toward each aperture hole corresponding to each microlens on at least one aperture layer;

Step S103: The photosensitive sensor unit on the photosensitive sensor array receives the reflected light passing through the corresponding aperture hole, and generates a fingerprint photosensitive signal for fingerprint recognition.

Since similar symbols and letters indicate similar items in the accompanying drawings, if an item is defined once in one drawing, there is no need to additionally define or explain it in the accompanying drawings.

In addition, in the description of the present disclosure embodiment, unless explicitly defined and limited otherwise, "mounting", "connection", "connection", etc. should be understood in a broad sense. For example, it may be a fixed connection, may be detachably connected, or may be integrally connected; It may be a mechanical connection or an electrical connection; It may be directly connected, or may be indirectly connected through an intermediate intermediary, and may be communication between the two components. Those skilled in the art will be able to understand the specific meaning of the above-described terms in the present disclosure based on specific circumstances.

In the description of the present disclosure, the direction or positional relationship indicated by “center”, “top”, “bottom”, “left”, “right”, “vertical”, “horizontal”, “in”, “outside”, etc. It is based on the direction or positional relationship shown in, and is only for convenience and brief description of the description of the present disclosure, meaning that the device or component they represent must have a specific direction or be configured and operated in a specific direction Therefore, it should not be construed as a limitation on the present disclosure. Also, terms such as “first,” “second,” “third,” etc. are used for descriptive purposes and are not to be understood as indicating or implying relative importance.

Finally, the above embodiments are only specific examples for describing the technical solution method of the present disclosure, and are not intended to limit the present disclosure, and the protection scope of the present disclosure is not limited thereby. Although the present disclosure has been described in detail with reference to the above-described embodiments, those skilled in the art may modify or easily envision changes in the technical solutions described in the above-described embodiments within the technical scope of the present disclosure, or some of the techniques features and the like may be substituted for equivalents; Such modifications, changes, or substitutions do not deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure the essence of the corresponding technical solutions, and all are included within the protection scope of the present disclosure. Accordingly, the protection scope of the present disclosure is determined based on the protection scope of the claims.

In the optical fingerprint recognition device provided in the embodiment of the present disclosure, the optical fingerprint recognition device may be installed below the OLED display device, and from one side adjacent to the OLED display device, the optical fingerprint recognition device includes a microlens layer, at least one aperture layer and a photosensitive sensor array in order from top to bottom; The microlens layer includes a plurality of micro lenses, the aperture layer includes a plurality of aperture holes, the photosensitive sensor array includes a plurality of photosensitive sensor units, and the microlenses and the aperture holes correspond one-to-one, so that each microlens corresponds to one above-described photosensitive sensor unit. Thereby, the light signal reflected by the finger, coming from the direction of the OLED display element, passes through the microlens and then again passes through the aperture hole of the at least one aperture layer, so that the light receiving angle of the reflected light signal can be limited by the aperture hole. and the angle of the reflected light signal is limited within a very small angle range above it, thereby reducing the optical crosstalk phenomenon when the reflected light signal is received by the photosensitive sensor unit, thereby improving the imaging effect of the optical imaging structure.

20-microlens layer; 30 - aperture layer; 40 - photosensitive sensor array layer; 202 - microlens; 302 - aperture hole; 50 - an infrared filtering layer; 60- a first transparent intervening layer; 70-second transparent intervening layer; 80 - base layer; 90 - buffer layer; 91 - layer of color filter film; 303 - first stop layer; 304 - second diaphragm layer; 305 - transparent protective layer; 306 - third diaphragm layer; 307 - fourth diaphragm layer; 308 - fifth stop layer; 309 - metal aperture layer; 310 - a third transparent intervening layer; 311 - a fourth transparent intervening layer; 312-5th transparent intervening layer; 313 - Sixth transparent intervening layer.

Claims (17)

An optical fingerprint reader configured to be installed underneath an OLED display element, comprising:
a microlens layer, at least one diaphragm layer, and a photosensitive sensor array from one side adjacent the OLED display element, in order from top to bottom;
The microlens layer includes a plurality of microlenses,
The diaphragm layer includes a plurality of diaphragm holes,
The photosensitive sensor array includes a plurality of photosensitive sensor units,
The microlens corresponds 1:1 with the aperture hole, and one photosensitive sensor array corresponds to each microlens,
An optical signal reflected by a finger, coming from the direction of the OLED display element, passes through the plurality of microlenses and then again passes through an iris hole of the at least one diaphragm layer and is received by the photosensitive sensor unit. fingerprint recognition device.
The optical fingerprint recognition device according to claim 1, further comprising an infrared filter layer provided between the microlens and the photosensitive sensor array.
3. The diaphragm layer according to claim 2, wherein the diaphragm layer is two layers, and includes a first diaphragm layer and a second diaphragm layer, and the aperture of the diaphragm hole of the first diaphragm layer adjacent to the microlens layer is on the photosensitive sensor array side. greater than the diaphragm aperture of the second diaphragm layer adjacent to;
The aperture of each aperture of the first aperture layer is the same, and the aperture of each aperture of the second aperture layer is the same.
The method of claim 3, further comprising a first transparent intervening layer and a second transparent intervening layer,
The microlens layer, the first transparent intervening layer, the first diaphragm layer, the second transparent intervening layer, the infrared filter layer, and the second diaphragm layer are arranged in order, the optical fingerprint recognition device. 5. The method of claim 4, wherein the first stop layer has a thickness of 0.8 μm to 3 μm,
the thickness of the second stop layer is 0.8 μm to 3 μm,
The aperture of the stop hole of the first stop layer is 5 μm to 15 μm, the aperture of the aperture hole of the second stop layer is 1.5 μm to 8 μm,
The first diaphragm layer and the second diaphragm layer have a distance of 5 μm to 20 μm,
The thickness of the first transparent intervening layer is 5 μm to 20 μm,
The thickness of the infrared filter layer is 5 μm to 8 μm, optical fingerprint recognition device.
6 . The optical fingerprint recognition according to claim 3 , further comprising a buffer layer between the infrared filter layer and the second stop layer, wherein the buffer layer is a silicon oxide layer or a silicon nitride layer. Device.
The optical fingerprint recognition device according to any one of claims 1 to 6, further comprising a color filter film layer provided between the microlens layer and the photosensitive sensor array.
The optical fingerprint recognition device according to claim 7, wherein the color filter film layer is installed adjacent to the microlens layer.
The optical fingerprint recognition device according to claim 7 or 8, characterized in that the thickness of the color filter film layer is 0.6 μm to 2 μm.
3. The diaphragm layer of claim 2, wherein the diaphragm layer comprises:
a third diaphragm layer adjacent to the microlens layer side, a fifth diaphragm layer adjacent to the photosensitive sensor array side, and at least one metal diaphragm layer provided between the photosensitive sensor array and the fifth diaphragm layer and
and the apertures of the aperture holes on the third stop layer, the fifth stop layer and the at least one metal stop layer sequentially decrease from top to bottom.
11. The optical fingerprint recognition device of claim 10, wherein the diaphragm layer further comprises a fourth diaphragm layer provided between the third diaphragm layer and the fifth diaphragm layer.
The optical fingerprint recognition device according to claim 10 or 11, characterized in that the infrared filter layer is provided between the metal stop layer and the fifth stop layer.
13. The optical fingerprint recognition device according to any one of claims 10 to 12, further comprising a transparent protective layer provided between the metal stop layer and the infrared filter layer.

12. The method according to claim 11, wherein a third transparent intervening layer is provided between the third diaphragm layer and the fourth diaphragm layer, a fourth transparent intervening layer is provided between the fourth diaphragm layer and the fifth diaphragm layer, and the fourth diaphragm layer is 3 Further comprising a fifth transparent interposition layer and a sixth transparent interposition layer sequentially installed from top to bottom between the stop layer and the microlens layer, wherein the sixth transparent intervening layer is a flat intervening layer, Optical fingerprint recognition device.
12. The method according to claim 11, wherein the aperture of each aperture hole of the third aperture layer is between 8 μm and 20 μm, and the aperture of each aperture hull of the fourth aperture layer is between 6 μm and 10 μm, and each of the fifth aperture layers has a diameter of between 6 μm and 10 μm. The aperture of the aperture hole is 6 μm to 7 μm, and the aperture of each aperture hole of the metal aperture layer is 1.5 μm to 4 μm.
An OLED display element and the optical fingerprint recognition device of any one of claims 1 to 15,
The optical fingerprint recognition device is characterized in that mounted below the OLED display element, a touch terminal.
A method applied to the optical fingerprint recognition device of any of claims 1 to 15, comprising:
controlling the OLED display element to emit an optical signal, the optical signal being reflected by a finger above the OLED display element to obtain reflected light;
transmitting the reflected light through each microlens of the microlens layer and irradiating it toward each aperture hole corresponding to each microlens on at least one aperture layer; and
and generating, by a photosensitive sensor unit on a photosensitive sensor array, a fingerprint photosensitive signal for fingerprint recognition by receiving the reflected light passing through a corresponding aperture hole.

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