WO2021146957A1

WO2021146957A1 - Optical fingerprint detection device, touch screen and electronic device

Info

Publication number: WO2021146957A1
Application number: PCT/CN2020/073633
Authority: WO
Inventors: 池文明; 王磊; 王炳文; 周飞
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2021-07-29
Also published as: CN111902823A

Abstract

The embodiments of the present application provide an optical fingerprint detection device, a touch screen, and an electronic device, relating to the field of fingerprint recognition technology, and being capable of improving the accuracy of fingerprint recognition when a finger is wet. The optical fingerprint detection device is applied to an electronic device having a display screen, the electronic device having a glass cover plate. The device comprises: a light-emitting assembly, the light-emitting assembly comprising a fingerprint recognition light source configured to provide excitation light for performing fingerprint recognition, an incidence angle at which light emitted from the fingerprint recognition light source is incident on the upper surface of the glass cover plate being equal to or greater than a total reflection angle at which an optical signal is incident to air from the glass cover plate; the optical fingerprint detection device further comprises an optical fingerprint module which is provided below a fingerprint detection region of the display screen and is configured to detect an optical signal that enables the fingerprint recognition light source to irradiate the finger above the fingerprint detection region, and transmits out of the finger and through the display screen.

Description

Optical fingerprint detection device, touch screen and electronic equipment

Technical field

This application relates to the field of fingerprint identification technology, and in particular to an optical fingerprint detection device, touch screen and electronic equipment.

Background technique

In recent years, with the continuous development of display technology, more and more electronic devices adopt under-screen fingerprint recognition to protect user privacy. When a user is operating an electronic device with fingerprint recognition function, he only needs to touch the display screen with his finger to realize authorization verification, and the operation is simple. However, the current under-screen fingerprint recognition method has poor fingerprint recognition accuracy when the finger is wet.

Summary of the invention

The embodiments of the present application provide an optical fingerprint detection device, a touch screen, and an electronic device, which can improve the accuracy of fingerprint recognition when the finger is wet.

On the one hand, an embodiment of the present application provides an optical fingerprint detection device,

Applied to an electronic device with a display screen, the electronic device has a glass cover, applied to an electronic device with a display screen, the electronic device has a glass cover, and the device includes:

A light-emitting component, the light-emitting component includes a fingerprint recognition light source, the fingerprint recognition light source is used to provide excitation light for fingerprint recognition, the light emitted by the fingerprint recognition light source is incident on the upper surface of the glass cover at an angle of incidence Greater than or equal to the total reflection angle of the light signal incident from the glass cover plate to the air;

The optical fingerprint detection device also includes an optical fingerprint module, which is arranged below the fingerprint detection area of the display screen, and is used to detect that the fingerprint recognition light source illuminates the finger above the fingerprint detection area and transmits from the finger And the light signal passing through the display screen.

On the other hand, an embodiment of the present application also provides a touch screen, including a glass cover and a display screen arranged under the glass cover, wherein the touch screen further includes the above-mentioned optical fingerprint detection device

In another aspect, an embodiment of the present application also provides an electronic device, including the above-mentioned optical fingerprint detection device.

In the optical fingerprint detection device, the touch screen and the electronic device in the embodiments of the present application, the fingerprint image is not generated based on the principle of reflection imaging, but is generated based on the principle of transmission. This application uses total reflection light as the light source for fingerprint identification. Since all the optical signals at the valley line are totally reflected and cannot be received by the optical fingerprint module, most of the optical signals at the ridge line are transmitted into the finger and come from the fingerprint. The ridges are transmitted through the display screen and are received by the optical fingerprint module. In this way, the optical signals returned from the ridges and valleys received by the optical fingerprint module have a higher contrast, and a better imaging effect can be obtained. Furthermore, when the finger is dipped in water, the fingerprint valley is filled with water, and the light is refracted at the interface between the water in the fingerprint valley and the glass cover. Since water has no backscattering property, the light derived from the water continues to be directed to the valley line of the finger And reflect back to the optical fingerprint recognition sensor through the valley line of the finger. As the light travels through the water, the optical path is increased and attenuation occurs. Therefore, after the finger is wet, the brightness of the finger tissue reflected from the fingerprint valley back to the optical fingerprint module and the finger tissue reflected from the fingerprint ridge back to the optical fingerprint module The brightness difference is still large, and the fingerprint valley and the fingerprint ridge still have a high light intensity contrast. The ratio of the light intensity between the two is about 1:100, which means that compared with the prior art, the fingerprint is still better when wet. It can have better imaging quality, thereby improving the accuracy of fingerprint recognition when wet. On the other hand, if the 2D image made with finger fingerprints is placed in the fingerprint recognition position, because the 2D image and the surface of the glass cover will be in overall contact or there will be no overall contact, it is impossible to distinguish between the fingerprint valley and the fingerprint ridge to achieve total reflection and refraction of light. Therefore, the fake fingerprint imaging of the 2D image does not clearly reflect the difference between the fingerprint valley and the fingerprint ridge, which reduces the probability of being recognized as a true fingerprint and improves the security. On the other hand, since the light required for fingerprint identification is provided by the light source outside the display screen, the external light source can be controlled separately, and it is not necessary to wait for the pixels in the display screen to light up through the control method of the display screen, thus saving fingerprint identification. The time can improve the speed and accuracy of fingerprint recognition.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

Fig. 1 is a schematic diagram of an under-screen fingerprint recognition state in the prior art;

Fig. 2 is a partial enlarged schematic diagram of a partial area of Fig. 1;

3 is a schematic diagram of an electronic device in a fingerprint recognition state in an embodiment of the application;

4 is a partial enlarged schematic diagram of a part of the area where light enters the glass cover in FIG. 3;

FIG. 5 is a partial enlarged schematic diagram of a part of the area in the glass cover plate at the fingerprint recognition location in FIG. 3; FIG.

Fig. 6 is a top view of the first electronic device in an embodiment of the application;

FIG. 7 is a schematic cross-sectional structure diagram of another electronic device in an embodiment of the application;

8 is a schematic cross-sectional structure diagram of still another electronic device in an embodiment of the application;

9 is a schematic cross-sectional structure diagram of another electronic device in an embodiment of the application;

FIG. 10 is a top view of a second type of electronic device in an embodiment of the application;

FIG. 11 is a top view of a third electronic device in an embodiment of the application;

FIG. 12 is a top view of a fourth type of electronic device in an embodiment of the application;

FIG. 13 is a top view of a fifth electronic device in an embodiment of the application;

Fig. 14 is a top view of a sixth electronic device in an embodiment of the application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

In order to more clearly illustrate the technical effects of the embodiments of the present application, before describing the embodiments of the present application, the under-screen fingerprint recognition technology in the prior art is first introduced, as shown in FIG. 1, which is the prior art. A schematic diagram of fingerprint recognition status under the screen. The electronic device includes a laminated glass cover 1'and a display screen 2'. The display screen 2'includes a light-emitting device layer 20', and the light-emitting device layer 20' is provided with a light-emitting device (Figure (Not shown in ), the light-emitting device realizes screen display by actively emitting light, and an optical fingerprint module 3'is provided under the light-emitting device layer 20' at the position of fingerprint recognition.

It should be understood that, for ease of description, the above-mentioned reflected light and scattered light are collectively referred to as reflected light. Because the ridge and valley of the fingerprint have different light reflection capabilities, the reflected light from the fingerprint ridge and the reflected light from the fingerprint valley have different light intensities. After the reflected light passes through the display screen, it is optically fingerprinted. The sensor array in the module receives and converts into the corresponding electrical signal, that is, the fingerprint detection signal; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby realizing optical fingerprint recognition in the electronic device Function.

Refer also to Figure 2 for a schematic diagram based on the principle of reflected light imaging. Fingers touch the surface of the glass cover of the mobile phone during fingerprint recognition. The ridges of the fingerprints of the fingers can make good contact with the surface, and the valley lines of the fingerprints of the fingers are in good contact with the surface. A void, the void is air.

According to the law of optical refraction and reflection, when the light I irradiates the finger, the fingerprint ridge line is in good contact, and the refractive index of the finger and the glass cover is similar, so the light absorbed by the finger IT1 is more, and the reflected light IR1 is more. However, there is an air gap at the valley line. Because the refractive index difference between air and the glass cover is large, the light IT2 refracted into the finger is less, and the reflected light IR2 reflected on the surface of the glass cover is more, thus forming Based on the contrast signal between the valley and ridges of the fingerprint, the reflected signal IR2 at the valley line is stronger, while the reflected signal IR1 at the ridge line is weak, that is, the ridge line is dark and the valley line is bright, and the fingerprint sensor passes through the valley line and the ridge line. The signal difference at the location can then form a fingerprint image.

However, when the finger is wet, the valley line and the glass cover 1'are filled with water, resulting in an increase in the light transmission part of the glass cover 1'at the valley line and a decrease in the light reflection part, resulting in the valley line. The difference between the light intensity received by the ridge and the ridge is small, thus reducing the accuracy of fingerprint recognition when the fingerprint is dipped in water. On the other hand, if a 2D image made using finger fingerprints is placed in a fingerprint recognition position as a fake fingerprint, the prior art may recognize the fake fingerprint as a real fingerprint, which may bring security risks. On the other hand, the prior art uses the light-emitting device in the display screen as the light source for fingerprint collection. When performing fingerprint recognition, it is necessary to first control to light up the pixels in the fingerprint recognition area, and the light-emitting device in the driving pixel takes longer to light up. It usually takes 50-100ms, but usually the user’s finger pressing time is 150-200ms during fingerprint recognition, and only 50-150ms is used to realize fingerprint collection, so it is easy to cause inaccurate fingerprint collection, which leads to fingerprint recognition efficiency Low.

As shown in Figure 3, Figure 4, Figure 5 and Figure 6, Figure 3 is a schematic diagram of an electronic device in an embodiment of this application in a fingerprint recognition state, and Figure 4 is a partial area where light enters the glass cover in Figure 3 Fig. 5 is a partial enlarged schematic view of a part of the area in the glass cover plate of the fingerprint recognition in Fig. 3, and Fig. 6 is a top view of the first electronic device in an embodiment of the application. This application provides a An optical fingerprint detection device is applied to an electronic device with a display screen 1. The electronic device has a glass cover 2. The optical fingerprint detection device includes a light-emitting component, the light-emitting component includes a fingerprint recognition light source 3, and the fingerprint recognition light source 3 is used to provide The excitation light for fingerprint recognition, the incident angle of the light emitted by the fingerprint recognition light source 3 to the upper surface of the glass cover plate 2 is greater than or equal to the total reflection angle of the light signal from the glass cover plate 2 into the air; the optical fingerprint detection device also includes The optical fingerprint module 4 is arranged below the fingerprint detection area 10 of the display screen 1 and is used to detect the light signal that the fingerprint recognition light source 3 illuminates the finger above the fingerprint detection area 10 and transmits from the finger and passes through the display screen 1.

Specifically, the structure shown in FIGS. 3 to 5 is a cross-sectional structure of an electronic device, in which the upper side of the display screen 1 is the light-emitting side, the display screen 1 is arranged under the glass cover 2, and the fingerprint recognition light source 3 is used to generate The light used for fingerprint recognition, for example, in the structure shown in FIGS. 3 to 5, in the glass cover 2, the light generated by the fingerprint recognition light source 3 enters the glass cover 2 from the lower surface of the glass cover 2 , Launch to the upper left.

Among them, the optical fingerprint module 4 may be, for example, an optical sensor array, which can collect light returned from the finger to determine the spatial pattern and position of the fingerprint ridge and fingerprint valley, and construct the fingerprint pattern and perform fingerprint recognition, for example, as a user authentication As part of the device access process, it is compared with the stored fingerprint patterns of authorized users to determine whether the detected fingerprint is a matching fingerprint.

In the optical fingerprint detection device in the embodiment of the present application, when the first optical signal L reaches the glass cover, due to the gap between the fingerprint valley line and the glass cover, the first optical signal L is totally reflected at the valley. Since the density of fingerprints is greater than the density of air, the total reflection angle of the optical signal from the glass cover to the ridge of the finger is greater than the total reflection angle of the optical signal from the glass cover to the air. When the ridge is in contact with the glass cover, A part of the first light signal that reaches the ridge is reflected, and a part is transmitted into the ridge of the finger, and the light signal transmitted into the finger is used for fingerprint imaging.

The reflected light LR1 at the ridge line and the reflected light LR2 at the valley line will be totally reflected on the upper and lower surfaces of the glass cover, and finally attenuated. After the transmitted light LT1 at the ridge enters the finger, it is transmitted from the finger to form a first return light signal. After the first return light signal passes through the display screen, it is received by the optical fingerprint module below the display screen. The optical fingerprint module performs fingerprint identification according to the received first return light signal.

Since the light signal at the valley line is totally reflected, the fingerprint sensor can hardly receive the light signal returned at the valley line, and most of the light signal at the ridge line will be transmitted into the finger, and then transmitted from the finger by the fingerprint sensor Received, so that the fingerprint sensor can perform fingerprint recognition based on the intensity difference of the light signal at the ridge and valley.

Compared with the traditional fingerprint recognition method, this application uses transmitted light for imaging, and the contrast of the light signal at the ridges and ridges can reach 1:200. In this way, using transmitted light for imaging can obtain 5 times the traditional reflected light. The imaging signal can obtain better imaging quality, which is beneficial to improve the success rate of fingerprint recognition.

In addition, when the finger is dipped in water, the fingerprint valley is filled with water, and the light is refracted at the interface between the water in the fingerprint valley and the glass cover. Since water has no backscattering property, the light derived from the water continues to be directed to the valley line of the finger. , And reflected back to the optical fingerprint recognition sensor through the valley line of the finger. As the light travels through the water, the optical path is increased and attenuation occurs. Therefore, after the finger is wet, the brightness of the finger tissue reflected from the fingerprint valley back to the optical fingerprint module and the finger tissue reflected from the fingerprint ridge back to the optical fingerprint module The brightness difference is still large, and the fingerprint valley and the fingerprint ridge still have a high light intensity contrast. The ratio of the light intensity between the two is about 1:100, which means that compared with the prior art, the fingerprint is still better when wet. It can have better imaging quality, thereby improving the accuracy of fingerprint recognition when wet. On the other hand, if the 2D image made with finger fingerprints is placed in the fingerprint recognition position, because the 2D image and the surface of the glass cover will be in overall contact or there will be no overall contact, it is impossible to distinguish between the fingerprint valley and the fingerprint ridge to achieve total reflection and refraction of light. Therefore, the fake fingerprint imaging of the 2D image does not clearly reflect the difference between the fingerprint valley and the fingerprint ridge, which reduces the probability of being recognized as a true fingerprint and improves the security. On the other hand, since the light required for fingerprint identification is provided by the light source outside the display screen, the external light source can be controlled separately, and it is not necessary to wait for the pixels in the display screen to light up through the control method of the display screen, thus saving fingerprint identification. The time can improve the speed and accuracy of fingerprint recognition.

Optionally, the angle between the initial light path that the light generated by the fingerprint recognition light source 3 enters the glass cover 2 and the normal F of the plane where the glass cover 2 is located is θ, 41.8°<θ<72.4°, The normal line F of the plane where the glass cover plate 2 is located is the normal line of the upper surface of the glass cover plate 2. The initial light path is that the light generated by the fingerprint recognition light source 3 enters the glass cover plate 2 for the first time and then starts to be transmitted in the glass cover plate 2 Light path.

Specifically, the structure shown in FIGS. 3 to 5 is a cross-sectional structure of the display device, in which the upper side of the display screen 1 is the light-emitting side, the display screen 1 is arranged under the glass cover 2, and the fingerprint recognition light source 3 is used for The light for fingerprint recognition, the light generated by the fingerprint recognition light source 3 is incident obliquely into the glass cover 2 from the lower surface of the glass cover 2. For example, in the structure shown in FIGS. 3 to 5, the light generated in the glass cover 2 , The light generated by the fingerprint recognition light source 3 enters from the bottom right and emits to the top left. At this time, θ is limited to the range of 41.8°～72.4°. When the initial light of the light entering the glass cover 2 reaches the glass When covering the upper surface of the cover plate 2, the upper surface of the glass cover plate 2 is used as the incident surface, the initial light is taken as the incident light, θ is the angle between the incident light and the normal line F of the incident surface, the upper surface and the lower surface of the glass cover plate 2 Parallel, when the upper surface of the glass cover 2 is in contact with air somewhere, this position may be the area outside the finger pressing, or it may be the position of the valley line where the finger presses, where the upper surface of the glass cover 2 is glass At the interface between the two media with air, the refractive index n ₁ of the glass cover 2 is 1.5, and the refractive index n ₂ of air is 1. When light enters the medium with a lower refractive index from a medium with a higher refractive index , With a critical angle θ _a ,

The angle of incidence θ> when θ _a, so the light will be totally reflected. When the upper surface of the glass cover plate 2 touches the user's finger somewhere, that is, when the position is the position of the ridge line, the upper surface of the glass cover plate 2 at this position is the interface between the glass and the skin. The refractive index n1 of the plate 2 is 1.5, and the refractive index n3 of the skin is 1.43. When light enters a medium with a lower refractive index from a medium with a higher refractive index, it has a critical angle θ _b ,

The angle of incidence θ <θ _b, and therefore the light will refract the incident light enters the finger from the coupling ridge cover glass 2, so as to illuminate the ridge, the ridge is illuminated by light rays further cover glass 2 and The display screen 1 is transmitted to the optical fingerprint module 4, so that the optical fingerprint module 4 receives higher light intensity at the ridge line, and at the valley line, because the light in the glass cover 2 will continue to propagate through total reflection, Therefore, the optical fingerprint module 4 receives a lower intensity of light at the valley line, and realizes fingerprint collection by comparing the light intensity received at the ridge line and the valley line.

Optionally, the light generated by the fingerprint recognition light source 3 is infrared light.

Specifically, infrared light is invisible light, and the light generated by the display screen 1 itself is visible light. When the light generated by the fingerprint recognition light source 3 is infrared light, the optical fingerprint module 4 can be set to be used only for Infrared light is received, but visible light is not received. In this way, the adverse effect of visible light generated by the display screen of the display screen 1 on fingerprint recognition can be reduced.

Optionally, the wavelength of the light generated by the fingerprint recognition light source 3 is λ, 920nm<λ<960nm.

Specifically, on the one hand, the wavelength of 920nm<λ<960nm belongs to the wavelength of infrared light, which is invisible light. The light generated when the screen 1 itself displays the screen is visible light. When the fingerprint recognition light source 3 generates infrared light At the same time, the optical fingerprint module 4 can be set at the same time to only receive infrared light and not to receive visible light. In this way, the visible light generated by the display screen 1 itself can reduce the adverse effect of fingerprint recognition; on the other hand, due to natural light Among them, the light intensity of 940nm wavelength is the smallest. Therefore, using 940nm light for fingerprint recognition can reduce the adverse effect of light on fingerprint recognition when natural light passes through the finger.

Optionally, the fingerprint recognition light source 3 is a vertical-cavity surface-emitting laser (Vecsel), and the light emitted by the vertical-cavity surface-emitting laser is incident on the upper surface of the glass cover plate 2 at an angle of incidence greater than or equal to the light The signal is incident from the glass cover 2 to the air at the total reflection angle.

Specifically, when a vertical cavity surface emitting laser is used as a light source, the direction of the light generated is stronger, and the light emitting angle is more concentrated, that is, it is easier to control the light path of the light generated by it, for example, it is easier to make the light generated in the Total reflection occurs on the upper surface of the glass cover plate 2, that is, it is easier to realize that the incident angle generated on the upper surface of the glass cover plate 2 is greater than or equal to the total reflection angle from the glass cover plate 2 to the air.

Optionally, the fingerprint recognition light source 3 includes a light-emitting diode and a condensing sheet located on the light-emitting side of the light-emitting diode. The condensing sheet is used to converge the light generated by the light-emitting diode, and it is easier to control the light path of the generated light.

Optionally, as shown in FIGS. 3 to 6, the light-emitting assembly further includes an optical glue 5, which is used to make the light exit surface of the fingerprint identification light source 3 adhere to the lower surface of the glass cover plate 2 through the optical glue 5; fingerprints The angle between the plane where the light exit surface of the light source 3 is located and the lower surface of the glass cover plate 2 is θ, and the angle θ is greater than or equal to the total reflection angle of the light signal from the glass cover plate 2 to the air; the refraction of the optical glue 5 The rate can range from 1.4 to 1.6, including endpoint values.

Specifically, through the arrangement of the optical glue 5, on the one hand, the fingerprint recognition light source 3 can be arranged obliquely near the lower surface of the glass cover plate 2, and on the other hand, the light exit surface of the fingerprint recognition light source 3 and the glass cover plate 2 can be set up. Fill the material with the same or similar refractive index as glass to improve the light utilization rate generated by the fingerprint identification light source 3. The inclination angle of the fingerprint identification light source 3 can be set according to the required angle of the light in the glass cover plate 2.

Optionally, as shown in FIG. 7, FIG. 7 is a schematic cross-sectional structure diagram of another electronic device in an embodiment of the application. The light-emitting assembly further includes: a first optical coupler 601, and the first optical coupler 601 includes a first surface 61 and the second surface 62, the included angle between the first surface 61 and the second surface 62 is θ, the included angle θ is greater than or equal to the total reflection angle of the optical signal from the glass cover 2 to the air; the first optical coupler The first surface 61 of the 601 is used to attach to the lower surface of the glass cover 2. The first surface 61 of the first optical coupler 601 and the lower surface of the glass cover 2 are parallel; the light exit surface of the fingerprint recognition light source 3 is used to pass the optical Glue (not shown in FIG. 7) is adhered to the second surface 62 of the first optical coupler 601, and the light exit surface of the fingerprint identification light source 3 is parallel to the second surface 62 of the first optical coupler 601; the refraction of the optical glue The rate can range from 1.4 to 1.6, including endpoint values.

Specifically, the first optical coupler 601 may specifically be a glass structural member with a trapezoidal cross-section. The first surface 61 is attached to the lower surface of the glass cover 2 and the second surface 62 is attached to the fingerprint recognition light source 3. The light exit surface, so that when it couples the light generated from the fingerprint recognition light source 3 into the glass cover 2, the light utilization rate generated by the fingerprint recognition light source 3 can be improved, so that the light path can be in the glass cover 2 according to the needs of the light path. The inclination angle of the fingerprint recognition light source 3 can be set in the direction of, even if the angle between the light output surface of the fingerprint recognition light source 3 and the lower surface of the glass cover 2 is set to θ.

Optionally, as shown in FIG. 8, FIG. 8 is a schematic cross-sectional structure diagram of another electronic device in an embodiment of the application. The light-emitting assembly further includes: a second optical coupler 602, and the second optical coupler 602 includes a third The surface 63, the fourth surface 64, and the fifth surface 65 connecting the third surface 63 and the fourth surface 64. The third surface 63 of the second optical coupler 602 is used to attach to the lower surface of the glass cover 2 for fingerprint recognition The light exit surface of the light source 3 is used to adhere to the fourth surface 64 of the second optical coupler 602 through optical glue. The refractive index of the optical glue can be 1.4 to 1.6, including the endpoint value; The fifth surface 65 of the second optical coupler 602 is reflected and incident on the glass cover 2.

Specifically, the structure shown in FIG. 8 is similar to the structure shown in FIG. 7, the difference is that in the structure shown in FIG. The light path is adjusted in the optical coupler 602, for example, the light path will be reflected, and then coupled into the glass cover plate 2 through the third surface 63, which is easier to control in the glass cover plate 2. The incident initial light path is on the plane of the glass cover plate 2 The angle between the normals of, in order to improve the light utilization rate generated by the fingerprint identification light source 3.

Optionally, as shown in FIG. 9, FIG. 9 is a schematic cross-sectional structure diagram of another electronic device in an embodiment of the application. The electronic device further includes: a middle frame 7 located on the side of the display screen 1 away from the glass cover 2. The identification light source 3 is used to be arranged on the middle frame 7; the light-emitting assembly further includes a reflector 600 located under the glass cover 2. The light emitted by the fingerprint identification light source 3 is reflected by the reflector 600 and then enters the glass cover 2, and The incident angle to the upper surface of the glass cover plate 2 is greater than or equal to the total reflection angle of the light signal from the glass cover plate 2 to the air.

Specifically, the fingerprint recognition light source 3 is arranged on the middle frame 7 below the display screen 1, and the light output path of the fingerprint recognition light source 3 can be adjusted by the fingerprint recognition light source 3 and the middle frame 7 to improve the fingerprint recognition light source 3. The generated light utilization rate, and because the fingerprint recognition light source 3 is located below the display screen 1, there is no need to occupy the space of the frame area of the electronic device, which is beneficial to the realization of a narrow frame.

Optionally, as shown in FIG. 9, the reflective device 600 is arranged on the side of the display screen 1, and the reflective surface of the reflective device 600 is perpendicular to the upper surface of the glass cover 2.

Optionally, as shown in FIGS. 3 and 6, the fingerprint recognition light source 3 includes a first light source 31, and the display screen 1 includes a first position 101 opposite to where the first light source 31 is located, and a position where the optical fingerprint module 4 is located. Relative to the second position 102, the second position 102 is the position where the fingerprint detection area 10 is located, and the first position 101 is located at a position where the center of the second position 102 extends along the length direction of the display screen 1. Among them, the fingerprint detection area 10 is located close to the bottom frame area 84 of the electronic device to facilitate the user to place fingers for fingerprint recognition. At the same time, the fingerprint recognition light source 3 is set in the bottom frame area 84 to prevent adverse effects on the display area. The location of the fingerprint detection area 10 is relatively close, which is convenient to provide the light source required for fingerprint identification.

Optionally, as shown in FIG. 3, FIG. 6, FIG. 10, and FIG. 11, FIG. 10 is a top view of a second type of electronic device in an embodiment of this application, and FIG. 11 is a top view of a third type of electronic device in an embodiment of this application , The fingerprint recognition light source 3 includes a first light source 31, the display screen 1 includes a first position 101 opposite to the position where the first light source 31 is located, and a second position 102 opposite to the position where the optical fingerprint module 4 is located, and the first position 101 is located The center of the second position 102 is one side of the position extending along the length direction of the display screen 1. The difference between the structure shown in FIG. 10 and the structure shown in FIG. 6 is that two fingerprint recognition light sources 3 are provided in the bottom frame area 84. The difference between the structure shown in FIG. 11 and the structure shown in FIG. 10 is that the two fingerprint recognition light sources 3 are respectively located at opposite ends of the bottom frame area 84, and the fingerprint detection area 10 can be provided from different directions for fingerprint recognition. Light.

Optionally, as shown in Figs. 3 and 12, Fig. 12 is a top view of a fourth electronic device in an embodiment of the application. The fingerprint recognition light source 3 includes a second light source 32 and a third light source 33, and the display screen 1 includes a second light source 32 and a third light source 33. The third position 103 opposite to the position of the second light source 32, the fourth position 104 opposite to the position of the third light source 33, and the second position 102, the third position 103 and the fourth position opposite to the position of the optical fingerprint module 4 104 is provided on both sides of the position extending along the length direction of the display screen 1 in the central position of the second position 102. In the structure shown in FIG. 12, the two fingerprint recognition light sources 3 are respectively located in the first side frame area 81 and the second side frame area 82 on the left and right sides, and the fingerprint recognition light source 3 and the fingerprint detection area 10 are both located near the bottom. .

Optionally, as shown in FIGS. 6 and 10 to 14, FIG. 13 is a top view of a fifth type of electronic device in an embodiment of this application, and FIG. 14 is a top view of a sixth type of electronic device in an embodiment of this application. It includes a first side frame area 81 and a second side frame area 82 opposite to each other. The electronic device also includes a top frame area 83 and a bottom frame area 84 opposite to each other; the distance between the fingerprint detection area 10 and the first side frame area 81 is h1 , The distance to the second side frame area 82 is h2, the distance to the top frame area 83 is h3, and the distance to the bottom frame area 84 is h4, h3>h1, h3>h2, h3>h4; fingerprint recognition light source The number of 3 is one or more; as shown in Figure 6, if the number of fingerprint identification light source 3 is one, then the fingerprint identification light source 3 is located in the bottom frame area 84; as shown in Figures 10 to 14, if the fingerprint identification light source 3 If the number is multiple, the multiple fingerprint recognition light sources 3 are located in at least one of the first side frame area 81, the second side frame area 82, and the bottom frame area 84, and any one of the fingerprint recognition light source 3 and the fingerprint detection area The distance between 10 is less than h3. In the structure shown in FIG. 13, three fingerprint recognition light sources 3 are provided in the bottom frame area 84, including the first position 101 located at the center of the second position 102 extending along the length direction of the display screen 1, and including The first position 101 is located on the side of the position where the center of the second position 102 extends along the length direction of the display screen 1. In the structure shown in FIG. 14, a fingerprint recognition light source 3 is each provided in the first side frame area 81, the second side frame area 82, and the bottom frame area 84, wherein the third position 103 corresponding to the second light source 32 is located In the first side frame area 81, the fourth position 104 corresponding to the third light source 33 is located in the second side frame area 82, and the first position 101 corresponding to the first light source 31 is located in the bottom frame area 84.

As shown in Figures 3 to 14, embodiments of the present application also provide a touch screen, including a glass cover 2 and a display screen 1 arranged under the glass cover 2, where the touch screen further includes the optical fingerprints in the above embodiments Detection device.

Specifically, the specific structures and principles of the glass cover plate 2, the display screen 1 and the optical fingerprint detection device are the same as those in the foregoing embodiment, and will not be repeated here. The touch screen may be any touch screen device with a display function, such as a touch screen, a mobile phone, a tablet computer, a notebook computer, or a television. Among them, the display screen 1 may specifically be, for example, an OLED (Organic Light-Emitting Diode, OLED) display screen.

Optionally, the angle between the initial light path that the light generated by the fingerprint recognition light source 3 enters the glass cover 2 and the normal F of the plane where the glass cover 2 is located is θ, 41.8°<θ<72.4°.

Optionally, as shown in FIGS. 3 to 6, the light-emitting assembly further includes an optical glue 5. The light exit surface of the fingerprint identification light source 3 is bonded to the lower surface of the glass cover 2 through the optical glue 5; the light emission of the fingerprint identification light source 3 The angle between the plane where the surface is located and the lower surface of the glass cover 2 is θ, which is greater than or equal to the total reflection angle of the optical signal from the glass cover 2 to the air; the refractive index of the optical glue 5 can be 1.4-1.6 , Including endpoint values.

Optionally, as shown in FIG. 7, the light-emitting assembly further includes: a first optical coupler 601, the first optical coupler 601 includes a first surface 61 and a second surface 62, between the first surface 61 and the second surface 62 The included angle θ is greater than or equal to the total reflection angle of the optical signal from the glass cover 2 to the air; the first surface 61 of the first optical coupler 601 is attached to the lower surface of the glass cover 2. The first surface 61 of the optical coupler 601 is parallel to the lower surface of the glass cover 2; the light exit surface of the fingerprint identification light source 3 is bonded to the second surface of the first optical coupler 601 by optical glue (not shown in FIG. 7) 62. The light exit surface of the fingerprint identification light source 3 is parallel to the second surface 62 of the first optical coupler 601; the refractive index of the optical glue may be 1.4-1.6, including the endpoint value.

Optionally, as shown in FIG. 8, the light-emitting assembly further includes: a second optical coupler 602. The second optical coupler 602 includes a third surface 63, a fourth surface 64, and a connection between the third surface 63 and the fourth surface 64. The fifth surface 65 of the second optical coupler 602, the third surface 63 of the second optical coupler 602 is attached to the lower surface of the glass cover plate 2, and the light exit surface of the fingerprint recognition light source 3 is bonded to the second optical coupler 602 by optical glue. On the four surfaces 64, the refractive index of the optical glue may be 1.4-1.6, including the endpoint value; the light generated by the fingerprint identification light source 3 is reflected by the fifth surface 65 of the second optical coupler 602 and then enters the glass cover 2.

Optionally, as shown in FIG. 9, the touch screen further includes a middle frame 7 located on the side of the display screen 1 away from the glass cover 2. The fingerprint recognition light source 3 is arranged on the middle frame 7; The light reflecting device 600 of the fingerprint recognition light source 3 is reflected by the light reflecting device 600 and then incident to the glass cover plate 2, and the incident angle of incident on the upper surface of the glass cover plate 2 is greater than or equal to that of the light signal from the glass cover plate 2. The angle of total reflection incident on the air.

An embodiment of the present application also provides an electronic device, including the optical fingerprint detection device in the foregoing embodiments. The specific structure and principle of the optical fingerprint detection device are the same as the foregoing embodiment, and will not be repeated here.

The above descriptions are only preferred embodiments of this application and are not intended to limit this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in this application Within the scope of protection.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application. scope.

Claims

An optical fingerprint detection device, which is applied to an electronic device with a display screen, the electronic device has a glass cover, and is characterized in that the device includes:

A light-emitting component, the light-emitting component includes a fingerprint recognition light source, the fingerprint recognition light source is used to provide excitation light for fingerprint recognition, the light emitted by the fingerprint recognition light source is incident on the upper surface of the glass cover at an angle of incidence Greater than or equal to the total reflection angle of the light signal incident from the glass cover plate to the air;

The optical fingerprint detection device also includes an optical fingerprint module, which is arranged below the fingerprint detection area of the display screen, and is used to detect that the fingerprint recognition light source illuminates the finger above the fingerprint detection area and transmits from the finger And the light signal passing through the display screen.
The optical fingerprint detection device according to claim 1, wherein the light generated by the fingerprint recognition light source is between the initial light path incident on the glass cover and the normal to the plane where the glass cover is located. The included angle is θ, 41.8°<θ<72.4°.
The optical fingerprint detection device according to claim 1, wherein:

The light generated by the fingerprint recognition light source is infrared light.
The optical fingerprint detection device according to claim 3, wherein:

The wavelength of the light generated by the fingerprint identification light source is λ, 920nm<λ<960nm.
The optical fingerprint detection device according to claim 1, wherein:

The fingerprint identification light source is a vertical cavity surface emitting laser, and the incident angle of the light emitted by the vertical cavity surface emitting laser to the upper surface of the glass cover plate is greater than or equal to that of the light signal from the glass cover plate into the air. Total reflection angle.
The optical fingerprint detection device according to claim 1, wherein:

The fingerprint recognition light source includes a light-emitting diode and a condensing sheet located on the light-emitting side of the light-emitting diode.
The optical fingerprint detection device according to claim 1, wherein:

The light-emitting assembly further includes an optical glue, which is used to make the light exit surface of the fingerprint identification light source adhere to the lower surface of the glass cover through the optical glue;

The included angle between the plane where the light exit surface of the fingerprint identification light source is located and the lower surface of the glass cover is θ, and the included angle θ is greater than or equal to the total reflection angle of the light signal incident from the glass cover to the air.
The optical fingerprint detection device according to claim 1, wherein:

The light-emitting assembly further includes a first optical coupler. The first optical coupler includes a first surface and a second surface. The angle between the first surface and the second surface is θ, and the clip The angle θ is greater than or equal to the total reflection angle of the optical signal incident from the glass cover plate to the air;

The first surface of the first optical coupler is used to be attached to the lower surface of the glass cover, and the first surface of the first optical coupler is parallel to the lower surface of the glass cover;

The light exit surface of the fingerprint identification light source is used for bonding to the second surface of the first optical coupler by optical glue, the light exit surface of the fingerprint identification light source and the second surface of the first optical coupler parallel.
The optical fingerprint detection device according to claim 1, wherein:

The light-emitting assembly further includes a second optical coupler. The second optical coupler includes a third surface, a fourth surface, and a fifth surface connecting the third surface and the fourth surface. The three surfaces are used to be attached to the lower surface of the glass cover, and the light exit surface of the fingerprint identification light source is used to adhere to the fourth surface of the second optical coupler by optical glue;

The light generated by the fingerprint identification light source is reflected by the fifth surface of the second optical coupler and then enters the glass cover plate.
The optical fingerprint detection device according to any one of claims 7 to 9, wherein the refractive index of the optical glue is 1.4 to 1.6.
The optical fingerprint detection device according to claim 1, wherein:

The electronic device further includes a middle frame located on a side of the display screen away from the glass cover, and the fingerprint recognition light source is configured to be arranged on the middle frame;

The light-emitting assembly further includes a reflective device located under the glass cover, and the light emitted by the fingerprint recognition light source is reflected by the reflective device and then incident on the glass cover, and incident on the glass cover The incident angle of the upper surface is greater than or equal to the total reflection angle of the light signal incident from the glass cover plate to the air.
The optical fingerprint detection device according to claim 11, wherein the reflective device is arranged on the side surface of the display screen, and the reflective surface of the reflective device is perpendicular to the upper surface of the glass cover.
The optical fingerprint detection device according to any one of claims 1 to 12, wherein:

The fingerprint recognition light source includes a first light source, the display screen includes a first position opposite to the position where the first light source is located, and a second position opposite to the position where the optical fingerprint module is located, the first position It is located at a position where the center of the second position extends along the length direction of the display screen.
The optical fingerprint detection device according to any one of claims 1 to 12, wherein:

The fingerprint recognition light source includes a first light source, the display screen includes a first position opposite to the position where the first light source is located, and a second position opposite to the position where the optical fingerprint module is located, the first position The center of the second position is located on one side of the position extending along the length direction of the display screen.
The optical fingerprint detection device according to any one of claims 1 to 12, wherein the fingerprint recognition light source comprises a second light source and a third light source, and the display screen comprises a position opposite to where the second light source is located. The third position, the fourth position opposite to the position of the third light source, and the second position opposite to the position of the optical fingerprint module, the third position and the fourth position are set in the The center position of the second position is on both sides of the position extending along the length direction of the display screen.
A touch screen, comprising a glass cover and a display screen arranged under the glass cover, wherein the touch screen further comprises the optical fingerprint detection device according to any one of claims 1 to 15.
The touch screen of claim 16, wherein:

The angle between the initial light path of the light generated by the fingerprint identification light source entering the glass cover and the normal of the plane where the glass cover is located is θ, 41.8°<θ<72.4°.
The touch screen of claim 16, wherein:

The light-emitting assembly further includes an optical glue, and the light exit surface of the fingerprint identification light source is bonded to the lower surface of the glass cover through the optical glue;

The included angle between the plane where the light exit surface of the fingerprint identification light source is located and the lower surface of the glass cover is θ, and the included angle θ is greater than or equal to the total reflection angle of the light signal incident from the glass cover to the air .
The touch screen of claim 16, wherein:

The light-emitting assembly further includes a first optical coupler. The first optical coupler includes a first surface and a second surface. The angle between the first surface and the second surface is θ, and the clip The angle θ is greater than or equal to the total reflection angle of the optical signal incident from the glass cover plate to the air;

The first surface of the first optical coupler is attached to the lower surface of the glass cover, and the first surface of the first optical coupler is parallel to the lower surface of the glass cover;

The light exit surface of the fingerprint identification light source is bonded to the second surface of the first optical coupler through optical glue, and the light exit surface of the fingerprint identification light source is parallel to the second surface of the first optical coupler.
The touch screen of claim 16, wherein:

The light-emitting assembly further includes a second optical coupler, and the second optical coupler includes

The third surface and the fourth surface have a fifth surface connecting the third surface and the fourth surface, the third surface of the optical coupler is used to attach to the lower surface of the glass cover, and the fingerprint identification light source The light exit surface is used for bonding to the fourth surface of the second optical coupler by optical glue;

The light generated by the fingerprint identification light source is reflected by the fifth surface of the second optical coupler and then enters the glass cover plate.
The touch screen of claim 16, wherein:

The touch screen also includes a middle frame located on a side of the display screen away from the glass cover, and the fingerprint recognition light source is configured to be arranged on the middle frame;

The light-emitting assembly further includes a light reflecting device located under the glass cover, and the light emitted by the fingerprint recognition light source is reflected by the light reflecting device and then incident on the glass cover and incident on the upper surface of the glass The incident angle of is greater than or equal to the total reflection angle of the optical signal from the glass cover plate to the air.
The touch screen of claim 21, wherein:

The light reflecting device is arranged on the side surface of the display screen, and the light reflecting surface of the light reflecting device is perpendicular to the upper surface of the glass cover plate.
The touch screen according to any one of claims 16 to 22, wherein:

The fingerprint recognition light source includes a first light source, the display screen includes a first position opposite to the position where the first light source is located, and a second position opposite to the position where the optical fingerprint module is located, the first position It is located at a position where the center of the two positions extends along the length direction of the display screen.
The touch screen according to any one of claims 16 to 22, wherein:

The fingerprint recognition light source includes a first light source, the display screen includes a first position opposite to the position where the first light source is located, and a second position opposite to the position where the optical fingerprint module is located, the first position The center of the two positions is located on one side of the position extending along the length direction of the display screen.
The touch screen according to any one of claims 16 to 22, wherein:

The fingerprint recognition light source includes a second light source and a third light source, and the display screen includes a third position opposite to the position of the second light source, a fourth position opposite to the position of the third light source, and The optical fingerprint module is located at a second position opposite to the position, and the third position and the fourth position are set on both sides of a position where the central position of the second position extends along the length direction of the display screen.
An electronic device, characterized by comprising the optical fingerprint detection device according to any one of claims 1 to 15.