CN111902823A - Optical fingerprint detection device, touch screen and electronic equipment - Google Patents

Abstract

The embodiment of the application provides an optical fingerprint detection device, a touch screen and electronic equipment, relates to the technical field of fingerprint identification, and can improve the accuracy of fingerprint identification under the condition that a finger is stained with water. This optics fingerprint detection device is applied to the electronic equipment who has the display screen, electronic equipment has the glass apron, the device includes: the light-emitting component comprises a fingerprint identification light source, the fingerprint identification light source is used for providing excitation light for fingerprint identification, and the incident angle of light emitted by the fingerprint identification light source, which is incident to the upper surface of the glass cover plate, is greater than or equal to the total reflection angle of an optical signal, which is incident to the air from the glass cover plate; the optical fingerprint detection device further comprises an optical fingerprint module, which is arranged below the fingerprint detection area of the display screen and used for detecting the irradiation of the fingerprint identification light source on the finger above the fingerprint detection area and transmitting the finger out and passing through the optical signal of the display screen.

Description

Optical fingerprint detection devices, touch screens and electronic equipment

technical field

The present application relates to the technical field of fingerprint identification, and in particular, to an optical fingerprint detection device, a touch screen and an electronic device.

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 operates an electronic device with a fingerprint recognition function, the user only needs to touch the display screen with a finger to realize authorization verification, and the operation is simple. However, the current fingerprint recognition method under the screen has poor fingerprint recognition accuracy under the condition that the finger is wet.

SUMMARY OF THE INVENTION

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 under the condition that a finger is wetted with water.

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 identification light source, the fingerprint identification light source is used to provide excitation light for fingerprint identification, and the light emitted by the fingerprint identification light source is incident on the incident angle of the upper surface of the glass cover plate 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 further 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 identification 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 further provides a touch screen, including a glass cover plate and a display screen disposed under the glass cover plate, wherein the touch screen further includes the above-mentioned optical fingerprint detection device.

In yet another aspect, an embodiment of the present application further 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 recognition. Since all the optical signals at the valley line are totally reflected and cannot be received by the optical fingerprint module, most of the light signals at the ridge line are transmitted into the finger, and are transmitted from the fingerprint of the finger. The ridges transmit through the display screen and are received by the optical fingerprint module, so that the optical signals returned by the ridges and valleys received by the optical fingerprint module have high contrast, and a better imaging effect can be obtained. Further, when the finger is wet with water, the fingerprint valley is filled with water, and the light is refracted at the interface between the water and the glass cover in the fingerprint valley. Since the water has no backscattering property, the light derived from the water continues to guide the valley line of the finger. , and reflected back to the optical fingerprint recognition sensor through the valley line of the finger. Since the light travels through water, the optical path increases and the attenuation occurs. Therefore, after the finger is wet with water, the brightness of the finger tissue reflected back to the optical fingerprint module from the fingerprint valley and the brightness reflected from the finger tissue at the fingerprint ridge back to the optical fingerprint module The brightness difference is still large, and there is still a high light intensity contrast between the fingerprint valley and the fingerprint ridge. It can have better imaging quality, thereby improving the accuracy of fingerprint identification when wet. On the other hand, if the 2D image produced by the fingerprint is placed at the position of fingerprint recognition, since the 2D image and the surface of the glass cover will be in contact with or without contact as a whole, it is impossible to distinguish the fingerprint valley and the fingerprint ridge to achieve total reflection and refraction of light respectively. , so 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 real fingerprint and improves the security. On the other hand, since the light required for fingerprint recognition is provided by a light source other than 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 recognition. time, which can improve the speed and accuracy of fingerprint recognition.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present application, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic diagram of a fingerprint identification state under a screen in the prior art;

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

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

FIG. 4 is a partially enlarged schematic view of the part of the region where the light enters the glass cover plate in FIG. 3;

FIG. 5 is a partially enlarged schematic diagram of a part of the area in the glass cover plate at the fingerprint identification place in FIG. 3;

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

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

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

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

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

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

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

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 present application.

Detailed ways

In order to make the purposes, 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 below with reference to the 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 the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present 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. As used in the embodiments of this application and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

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 firstly introduced, as shown in FIG. 1 , which is the prior art A schematic diagram of the fingerprint identification state under the screen, the electronic device includes a glass cover plate 1' and a display screen 2' arranged in layers, and 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 (Fig. (not shown in the figure), 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 the convenience of description, the above-mentioned reflected light and scattered light are collectively referred to as reflected light. Since the ridges and valleys of the fingerprint have different reflection capabilities for light, 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, the optical fingerprint The sensor array in the module receives and converts it into a corresponding electrical signal, that is, a 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.

Referring to FIG. 2 together, a schematic diagram based on the principle of reflected light imaging, the finger touches the surface of the glass cover of the mobile phone when performing fingerprint recognition, wherein the fingerprint ridge of the finger can be in good contact with the surface, and the valley line of the fingerprint of the finger exists with the surface. A void, the void is air.

According to the law of refraction and reflection of optics, 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 more light IT1 is absorbed by the finger, while the reflected light IR1 is more However, there is an air gap at the valley line. Due to the large difference in the refractive index between the air and the glass cover, the light IT2 refracted into the finger is less, and the reflected light IR2 reflected on the surface of the glass cover is more. The contrast signals between the fingerprint valleys and ridges are obtained. The reflected signal IR2 at the valley line is strong, while the reflected signal IR1 at the ridge line is weak, that is, the ridge line is dark, and the valley line is bright. 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 wetted with water, the gap between the valley line and the glass cover 1' is 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, thus causing the valley line at the The difference in light intensity received by the ridge line and the ridge line is small, thus reducing the accuracy of fingerprint recognition when the fingerprint is wet. On the other hand, if a 2D image produced by using a finger fingerprint is placed at the position of fingerprint identification as a fake fingerprint, the existing technology may identify the fake fingerprint as a real fingerprint, thereby bringing security risks. On the other hand, in the prior art, the light-emitting device in the display screen is used as the light source for fingerprint collection. When fingerprint recognition is performed, it is necessary to control the pixels in the fingerprint recognition area to light up first, and the light-emitting device in the driving pixel needs to be turned on for a relatively long time. It usually takes 50-100ms, and usually the user's finger pressing time is 150-200ms when performing fingerprint recognition, and only 50-150ms is used for fingerprint collection, so it is easy to lead to inaccurate fingerprint collection, which leads to fingerprint recognition efficiency. Low.

As shown in FIG. 3, FIG. 4, FIG. 5 and FIG. 6, FIG. 3 is a schematic diagram of an electronic device in an embodiment of the application in a fingerprint recognition state, and FIG. 4 is a partial area where light enters the glass cover in FIG. 3 Fig. 5 is a partially enlarged schematic diagram of a part of the glass cover plate at the fingerprint recognition place in Fig. 3, Fig. 6 is a top view of the first electronic device in the embodiment of the application, and the application provides a An optical fingerprint detection device, 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 identification light source 3, and the fingerprint identification light source 3 is used to provide The excitation light for fingerprint identification, the incident angle of the light emitted by the fingerprint identification 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 incident from the glass cover plate 2 to the air; the optical fingerprint detection device also includes: The optical fingerprint module 4 is disposed below the fingerprint detection area 10 of the display screen 1 , and is used to detect the light signal from the fingerprint identification light source 3 illuminating the finger above the fingerprint detection area 10 and transmitted from the finger and passing through the display screen 1 .

Specifically, the structures shown in FIGS. 3 to 5 are cross-sectional structures of electronic devices, wherein the top 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 structures shown in FIGS. 3 to 5 , in the cover glass 2 , the light generated by the fingerprint recognition light source 3 enters the cover glass 2 from the lower surface of the cover glass 2 . , fires to the upper left.

Wherein, the optical fingerprint module 4 can be, for example, an optical sensor array, which can collect the 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 to stored fingerprint patterns of authorized users to determine if the detected fingerprint is a match.

In the optical fingerprint detection device in the embodiment of the present application, when the first optical signal L reaches the glass cover plate, due to the gap between the fingerprint valley line and the glass cover plate, the first optical signal L is totally reflected at the valley. Since the density of fingerprints is greater than that of air, the total reflection angle of the light signal incident from the glass cover to the finger ridge line is greater than the total reflection angle of the light signal incident from the glass cover to the air. When the ridge line is in contact with the glass cover, the A part of the first optical signal reaching the ridge is reflected, and a part is transmitted into the ridge of the finger, and the optical 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 line enters the finger, it is transmitted out of the finger to form the 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 signals at the valley line are totally reflected, the fingerprint sensor hardly receives the light signal returned at the valley line, while 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 identification according to the intensity difference of the light signals at the ridges and valleys.

Compared with the traditional fingerprint identification method, this application uses transmitted light for imaging, and the contrast of the optical signal at the valley and the ridge can reach 1:200. In this way, the transmitted light is used for imaging, which 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 wet with water, the fingerprint valley is filled with water, and the light is refracted at the interface between the water and the glass cover in the fingerprint valley. Since water has no backscattering property, the light derived from the water continues to guide the valley line of the finger. , and reflected back to the optical fingerprint recognition sensor through the valley line of the finger. Since the light travels through water, the optical path increases and the attenuation occurs. Therefore, after the finger is wet with water, the brightness of the finger tissue reflected back to the optical fingerprint module from the fingerprint valley and the brightness reflected from the finger tissue at the fingerprint ridge back to the optical fingerprint module The brightness difference is still large, and there is still a high light intensity contrast between the fingerprint valley and the fingerprint ridge. It can have better imaging quality, thereby improving the accuracy of fingerprint identification when wet. On the other hand, if the 2D image produced by the fingerprint is placed at the position of fingerprint recognition, since the 2D image and the surface of the glass cover will be in contact with or without contact as a whole, it is impossible to distinguish the fingerprint valley and the fingerprint ridge to achieve total reflection and refraction of light respectively. , so 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 real fingerprint and improves the security. On the other hand, since the light required for fingerprint recognition is provided by a light source other than 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 recognition. time, which can improve the speed and accuracy of fingerprint recognition.

Optionally, the angle between the initial light path of the light generated by the fingerprint recognition light source 3 entering the glass cover plate 2 and the normal F of the plane where the glass cover plate 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 optical path is the light generated by the fingerprint recognition light source 3 that first enters the glass cover plate 2 and starts to transmit in the glass cover plate 2. light path.

入射角θ＞θ_a时，因此光线会发生全反射。当玻璃盖板2的上表面某处接触用户手指时，即该位置为脊线的位置时，该位置处玻璃盖板2的上表面为玻璃和皮肤两种介质之间的交界面，玻璃盖板2的折射率n₁为1.5，而皮肤的折射率n3为1.43，当光线从折射率较高的介质进入折射率较低的介质时，具有临界角θ_b，

入射角θ＜θ_b，因此光线会发生折射，使入射光从玻璃盖板2耦合进入手指的脊线，从而将脊线照亮，被照亮的脊线进一步将光线通过玻璃盖板2和显示屏1传输至光学指纹模组4，使得光学指纹模组4在脊线处接收到较高的光线强度，而在谷线处，由于玻璃盖板2中的光线会继续通过全反射传播，因此光学指纹模组4在谷线处接收到较低强度的光线强度，通过在脊线和谷线处接收到的光线强度的对比来实现指纹采集。Specifically, the structures shown in FIGS. 3 to 5 are the cross-sectional structures of the display device, wherein the upper part 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 light. The light for fingerprint recognition, the light generated by the fingerprint recognition light source 3 enters the glass cover 2 obliquely from the lower surface of the glass cover 2 , for example, in the structures shown in FIGS. 3 to 5 , in the glass cover 2 , the light generated by the fingerprint recognition light source 3 is incident from the lower right and emitted to the upper left. At this time, θ is limited to the range of 41.8° to 72.4°. When the initial light entering the glass cover 2 reaches the glass When the upper surface of the cover plate 2 is used, the upper surface of the glass cover plate 2 is used as the incident surface, the initial ray is used as the incident light, and θ is the angle between the incident light ray and the normal F of the incident surface. The upper and lower surfaces of the glass cover plate 2 Parallel, when the upper surface of the glass cover 2 is in contact with the air, this position may be the area outside the finger pressing, or it may be the position of the valley line where the finger is pressed, 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 plate 2 is 1.5, while the refractive index n ₂ of air is 1. When light enters a medium with a lower refractive index from a medium with a higher refractive index , with the critical angle θ _a ,

When the incident angle θ>θ _a , 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 two media, glass and skin. The refractive index n1 of plate ₂ is 1.5, while the refractive index n3 of the skin is 1.43, and has a critical angle _θb when light rays pass from a medium with a higher refractive index to a medium with a lower refractive index,

The incident angle θ< _θb , so the light will be refracted, so that the incident light will be coupled from the glass cover 2 into the ridge of the finger, thereby illuminating the ridge, and the illuminated ridge will further pass the light through the glass cover 2 and The display screen 1 is transmitted to the optical fingerprint module 4, so that the optical fingerprint module 4 receives a higher light intensity at the ridge line, and at the valley line, since the light in the glass cover 2 will continue to propagate through total reflection, Therefore, the optical fingerprint module 4 receives the light intensity of lower intensity 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 identification light source 3 is infrared light.

Specifically, the infrared light is invisible light, and the light generated by the display screen 1 itself when displaying the picture is visible light. When the light generated by the fingerprint identification light source 3 is infrared light, the optical fingerprint module 4 can be set to be only used 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 1 itself on the fingerprint recognition can be reduced.

Optionally, the wavelength of the light generated by the fingerprint identification 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 by the display screen 1 itself when displaying the picture is visible light, and the light generated by the fingerprint identification light source 3 is infrared light. At the same time, the optical fingerprint module 4 can be set to only receive infrared light and not receive visible light, so that the adverse effect of visible light generated by the display screen 1 itself on fingerprint recognition can be reduced; on the other hand, due to natural light 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 identification light source 3 is a vertical cavity surface emitting laser (Vertical-Cavity Surface-Emitting Laser, Vecsel), and the incident angle of the light emitted by the vertical cavity surface emitting laser to the upper surface of the glass cover plate 2 is greater than or equal to the light. The total reflection angle at which the signal is incident from the glass cover plate 2 to the air.

Specifically, when a vertical cavity surface emitting laser is used as a light source, the directionality of the light generated is stronger, and the emission angle is more concentrated, that is, it is easier to control the optical path of the light generated, for example, it is easier to make the generated light in 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 incident from the glass cover plate 2 to the air.

Optionally, the fingerprint identification light source 3 includes a light-emitting diode and a light-collecting sheet located on the light-emitting side of the light-emitting diode. The condensing sheet is used to condense 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, and the optical glue 5 is used to make the light exit surface of the fingerprint recognition light source 3 adhere to the lower surface of the glass cover plate 2 through the optical glue 5; 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 2 is θ, and the angle θ is greater than or equal to the total reflection angle of the light signal incident from the glass cover 2 to the air; the refraction of the optical glue 5 The ratio can be from 1.4 to 1.6, inclusive.

Specifically, through the setting of the optical glue 5 , on the one hand, the fingerprint recognition light source 3 can be obliquely arranged near the lower surface of the glass cover 2 , and on the other hand, the light exit surface of the fingerprint recognition light source 3 and the glass cover 2 can be installed. 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 , and the inclination angle of the fingerprint identification light source 3 can be set according to the angle required by the light in the glass cover plate 2 .

Optionally, as shown in FIG. 7 , which is a schematic cross-sectional structure diagram of another electronic device in an embodiment of the present 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 angle between the first surface 61 and the second surface 62 is θ, and the angle θ is greater than or equal to the total reflection angle of the light signal incident from the glass cover plate 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, and the first surface 61 of the first optical coupler 601 is parallel to the lower surface of the glass cover 2; the light exit surface of the fingerprint recognition light source 3 is used to pass the optical The 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 recognition light source 3 is parallel to the second surface 62 of the first optical coupler 601; the refraction of the optical glue The ratio can be from 1.4 to 1.6, inclusive.

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

Optionally, as shown in FIG. 8 , which is a schematic cross-sectional structure diagram of still another electronic device in the embodiment of the present application, the light emitting assembly further includes: a second optical coupler 602 , and the second optical coupler 602 includes a third optical coupler 602 . 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, fingerprint recognition The light emitting surface of the light source 3 is used for bonding to the fourth surface 64 of the second optical coupler 602 through optical glue, and the refractive index of the optical glue can be 1.4-1.6, including the end value; the light generated by the fingerprint recognition light source 3 passes through The fifth surface 65 of the second optical coupler 602 is reflected into the cover glass 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 optical path is adjusted in the optical coupler 602, for example, the optical 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 optical path is the same as the plane where the glass cover plate 2 is located. The included angle between the normals of the fingerprint identification light source 3 can improve the light utilization rate generated by the fingerprint identification light source 3 .

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

Specifically, the fingerprint identification light source 3 is arranged on the middle frame 7 below the display screen 1, and the light output path of the fingerprint identification light source 3 can be adjusted through the cooperation and fixation of the fingerprint identification light source 3 and the middle frame 7, so as to improve the performance of the fingerprint identification light source 3. The resulting light utilization rate, and since the fingerprint identification light source 3 is located below the display screen 1, it does not need to occupy the space of the frame area of the electronic device, which is conducive to the realization of a narrow frame.

Optionally, as shown in FIG. 9 , the reflective device 600 is disposed 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 FIG. 3 and FIG. 6 , 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 of the first light source 31 , and the position of the optical fingerprint module 4 . Opposite 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, so as to facilitate the user to place their fingers for fingerprint recognition. At the same time, the fingerprint recognition light source 3 is arranged 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 the application, and FIG. 11 is a top view of a third type of electronic device in an embodiment of the application , the fingerprint identification light source 3 includes a first light source 31, the display screen 1 includes a first position 101 opposite to the position of the first light source 31, and a second position 102 opposite to the position of the optical fingerprint module 4, the first position 101 is located at One side of the position where the center of the second position 102 extends 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 identification light sources 3 are arranged 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 identification light sources 3 are located at opposite ends of the bottom frame area 84 respectively, and can provide the fingerprint detection area 10 with light sources for fingerprint identification from different directions. light.

Optionally, as shown in FIG. 3 and FIG. 12, FIG. 12 is a top view of the fourth electronic device in the 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 The third position 103 opposite to the position of the two light sources 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 where the center position of the second position 102 extends along the length direction of the display screen 1 . 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 both the fingerprint recognition light source 3 and the fingerprint detection area 10 are located near the bottom. .

Optionally, as shown in FIG. 6 and FIG. 10 to FIG. 14 , FIG. 13 is a top view of a fifth electronic device in an embodiment of the present application, and FIG. 14 is a top view of a sixth electronic device in an embodiment of the present application. The electronic device Including the relative first side frame area 81 and the second side frame area 82, the electronic device also includes the opposite top frame area 83 and bottom frame area 84; the distance between the fingerprint detection area 10 and the first side frame area 81 is h1 , the distance from the second side frame area 82 is h2, the distance from the top frame area 83 is h3, and the distance from 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 recognition light sources 3 is one, the fingerprint recognition light source 3 is located in the bottom frame area 84; as shown in Figures 10 to 14, if the fingerprint recognition light source 3 If the number of fingerprint identification light sources 3 is multiple, then multiple fingerprint identification 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 fingerprint identification light source 3 and the fingerprint detection area are The distance between 10 is less than h3. In the structure shown in FIG. 13 , three fingerprint recognition light sources 3 are arranged 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 one 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 provided in each of 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 at 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 FIGS. 3 to 14 , the embodiments of the present application further provide a touch screen, including a glass cover 2 and a display screen 1 disposed under the glass cover 2 , wherein 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 the above-mentioned embodiments, and are not repeated here. The touch screen can be any touch screen device with a display function, such as a touch display screen, a mobile phone, a tablet computer, a notebook computer, or a television. 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 of the light generated by the fingerprint recognition light source 3 entering the glass cover plate 2 and the normal F of the plane where the glass cover plate 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, and 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 output of the fingerprint identification light source 3 is The angle between the plane where the surface is located and the lower surface of the cover glass 2 is θ, and the angle θ is greater than or equal to the total reflection angle of the light signal incident from the cover glass 2 to the air; the refractive index of the optical adhesive 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 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 plate 2 to the air; the first surface 61 of the first optical coupler 601 is attached to the lower surface of the glass cover plate 2, and the first 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 recognition light source 3 is bonded to the second surface of the first optical coupler 601 through 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, inclusive.

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, the third surface 63 of the second optical coupler 602 is attached to the lower surface of the glass cover 2, and the light exit surface of the fingerprint recognition light source 3 is bonded to the second optical coupler 602 through optical glue. On the four surfaces 64 , the refractive index of the optical glue can be 1.4-1.6, inclusive; 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 , and the fingerprint recognition light source 3 is arranged on the middle frame 7 ; The reflective device 600, the light emitted by the fingerprint recognition light source 3 is reflected by the reflective device 600 and then enters the glass cover 2, and the incident angle of the incident on the upper surface of the glass cover 2 is greater than or equal to the light signal from the glass cover 2. Total reflection angle incident to air.

Optionally, as shown in FIG. 9 , the reflective device 600 is disposed 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 FIG. 3 and FIG. 6 , 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 of the first light source 31 , and the position of the optical fingerprint module 4 . Opposite 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, so as to facilitate the user to place their fingers for fingerprint recognition. At the same time, the fingerprint recognition light source 3 is arranged 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 the application, and FIG. 11 is a top view of a third type of electronic device in an embodiment of the application , the fingerprint identification light source 3 includes a first light source 31, the display screen 1 includes a first position 101 opposite to the position of the first light source 31, and a second position 102 opposite to the position of the optical fingerprint module 4, the first position 101 is located at One side of the position where the center of the second position 102 extends 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 identification light sources 3 are arranged 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 identification light sources 3 are located at opposite ends of the bottom frame area 84 respectively, and can provide the fingerprint detection area 10 with light sources for fingerprint identification from different directions. light.

Optionally, as shown in FIG. 3 and FIG. 12, FIG. 12 is a top view of the fourth electronic device in the 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 The third position 103 opposite to the position of the two light sources 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 where the center position of the second position 102 extends along the length direction of the display screen 1 . 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 both the fingerprint recognition light source 3 and the fingerprint detection area 10 are located near the bottom. .

Embodiments of the present application further provide an electronic device, including the optical fingerprint detection device in the above-mentioned embodiments. The specific structure and principle of the optical fingerprint detection device are the same as those of the above-mentioned embodiments, and are not repeated here.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the present 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 present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; 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 (26)

1. An optical fingerprint detection device is applied to an electronic device with a display screen, wherein the electronic device is provided with a glass cover plate, and the device is characterized by comprising:

the light-emitting component comprises a fingerprint identification light source, the fingerprint identification light source is used for providing excitation light for fingerprint identification, and the incident angle of light emitted by the fingerprint identification light source, which is incident to the upper surface of the glass cover plate, is greater than or equal to the total reflection angle of an optical signal, which is incident to the air from the glass cover plate;

the optical fingerprint detection device further comprises an optical fingerprint module, which is arranged below the fingerprint detection area of the display screen and used for detecting the irradiation of the fingerprint identification light source on the finger above the fingerprint detection area and transmitting the finger out and passing through the optical signal of the display screen.

2. The optical fingerprint detection device according to claim 1, wherein an angle between an initial light path of light generated by the fingerprint identification light source and a normal of a plane where the glass cover plate is located is θ, and an angle between the initial light path of light generated by the fingerprint identification light source and the normal of the plane where the glass cover plate is located is 41.8 ° < θ < 72.4 °.

3. The optical fingerprint detection device according to claim 1,

the light generated by the fingerprint identification light source is infrared light.

4. The optical fingerprint detection device according to claim 3,

the wavelength of the light generated by the fingerprint identification light source is lambda, and lambda is more than 920nm and less than 960 nm.

5. The optical fingerprint detection device according to claim 1,

the fingerprint identification light source is a vertical cavity surface emitting laser, and the incident angle of light emitted by the vertical cavity surface emitting laser and incident on the upper surface of the glass cover plate is larger than or equal to the total reflection angle of light signals incident on air from the glass cover plate.

6. The optical fingerprint detection device according to claim 1,

the fingerprint identification light source comprises a light emitting diode and a light condensing sheet positioned on the light emitting side of the light emitting diode.

7. The optical fingerprint detection device according to claim 1,

the light emitting component further comprises optical cement, and the optical cement is used for enabling the light emergent surface of the fingerprint identification light source to be adhered to the lower surface of the glass cover plate through the optical cement;

the included angle between the plane of the light emergent surface of the fingerprint identification light source and the lower surface of the glass cover plate is theta, and the included angle theta is larger than or equal to the total reflection angle of the light signal incident to the air from the glass cover plate.

8. The optical fingerprint detection device according to claim 1,

the light-emitting component further comprises a first optical coupler, the first optical coupler comprises a first surface and a second surface, an included angle between the first surface and the second surface is theta, and the included angle theta is larger than or equal to a total reflection angle of an optical signal incident from the glass cover plate to air;

the first surface of the first optical coupler is used for being attached to the lower surface of the glass cover plate, and the first surface of the first optical coupler is parallel to the lower surface of the glass cover plate;

the light emergent surface of the fingerprint identification light source is used for being adhered to the second surface of the first optical coupler through an optical adhesive, and the light emergent surface of the fingerprint identification light source is parallel to the second surface of the first optical coupler.

9. The optical fingerprint detection device according to claim 1,

the light-emitting component further comprises a second optical coupler, the second optical coupler comprises a third surface, a fourth surface and a fifth surface connecting the third surface and the fourth surface, the third surface of the second optical coupler is used for being attached to the lower surface of the glass cover plate, and the light emergent surface of the fingerprint identification light source is used for being attached to the fourth surface of the second optical coupler through optical cement;

and light generated by the fingerprint identification light source is reflected by a fifth surface in the second optical coupler and then enters the glass cover plate.

10. The optical fingerprint detection device according to any one of claims 7 to 9, wherein the refractive index of the optical glue is 1.4-1.6.

11. The optical fingerprint detection device according to claim 1,

the electronic equipment further comprises a middle frame positioned on one side of the display screen, which is far away from the glass cover plate, and the fingerprint identification light source is arranged on the middle frame;

the light emitting assembly further comprises a light reflecting device located below the glass cover plate, light emitted by the fingerprint identification light source is reflected by the light reflecting device and then enters the glass cover plate, and an incident angle of the light signal entering the upper surface of the glass cover plate is larger than or equal to a total reflection angle of the light signal entering air from the glass cover plate.

12. The optical fingerprint sensing device of claim 11, wherein the reflector is disposed on a side of the display screen, and a reflective surface of the reflector is perpendicular to an upper surface of the glass cover.

13. The optical fingerprint detection device according to any one of claims 1 to 12,

the fingerprint identification light source comprises a first light source, the display screen comprises a first position and a second position, the first position is opposite to the position where the first light source is located, the second position is opposite to the position where the optical fingerprint module is located, and the first position is located at the center of the second position and is located at the position where the length direction of the display screen extends.

14. The optical fingerprint detection device according to any one of claims 1 to 12,

the fingerprint identification light source comprises a first light source, the display screen comprises a first position and a second position, the first position is opposite to the position where the first light source is located, the second position is opposite to the position where the optical fingerprint module is located, and the first position is located on one side of the position, extending along the length direction of the display screen, of the center of the second position.

15. The optical fingerprint detection device according to any one of claims 1 to 12, wherein the fingerprint identification light source comprises a second light source and a third light source, the display screen comprises 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 a second position opposite to the position of the optical fingerprint module, and the third position and the fourth position are disposed on two sides of a position where a center position of the second position extends along a length direction of the display screen.

16. A touch screen comprising a glass cover plate and a display screen disposed below the glass cover plate, wherein the touch screen further comprises an optical fingerprint detection device according to any one of claims 1 to 15.

17. The touch screen of claim 16,

the included angle between the initial light path of the light generated by the fingerprint identification light source and the normal of the plane where the glass cover plate is located is theta, and theta is larger than 41.8 degrees and smaller than 72.4 degrees.

18. The touch screen of claim 16,

the light emitting assembly further comprises optical cement, and a light emergent surface of the fingerprint identification light source is adhered to the lower surface of the glass cover plate through the optical cement;

the included angle between the plane of the light emergent surface of the fingerprint identification light source and the lower surface of the glass cover plate is theta, and the included angle theta is larger than or equal to the total reflection angle of the light signal from the glass cover plate to the air.

19. The touch screen of claim 16,

the light-emitting component further comprises a first optical coupler, the first optical coupler comprises a first surface and a second surface, an included angle between the first surface and the second surface is theta, and the included angle theta is larger than or equal to a total reflection angle of an optical signal incident from the glass cover plate to air;

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

the light emergent surface of the fingerprint identification light source is adhered to the second surface of the first optical coupler through an optical adhesive, and the light emergent surface of the fingerprint identification light source is parallel to the second surface of the first optical coupler.

20. The touch screen of claim 16,

the light emitting assembly further comprises a second optical coupler comprising

The third surface and the fourth surface are provided with a fifth surface for connecting the third surface and the fourth surface, the third surface of the optical coupler is used for being attached to the lower surface of the glass cover plate, and the light emergent surface of the fingerprint identification light source is used for being adhered to the fourth surface of the second optical coupler through optical cement;

and light generated by the fingerprint identification light source is reflected by a fifth surface in the second optical coupler and then enters the glass cover plate.

21. The touch screen of claim 16,

the touch screen further comprises a middle frame positioned on one side of the display screen, which is far away from the glass cover plate, and the fingerprint identification light source is arranged on the middle frame;

the light emitting assembly further comprises a light reflecting device located below the glass cover plate, light emitted by the fingerprint identification light source is reflected by the light reflecting device and then enters the glass cover plate, and the incident angle of the light incident on the upper surface of the glass is larger than or equal to the total reflection angle of the light signal from the glass cover plate to the air.

22. The touch screen of claim 21,

the reflecting device is arranged on the side face of the display screen, and the reflecting surface of the reflecting device is perpendicular to the upper surface of the glass cover plate.

23. The touch screen of any one of claims 16 to 22,

the fingerprint identification light source comprises a first light source, the display screen comprises a first position and a second position, the first position is opposite to the position where the first light source is located, the second position is opposite to the position where the optical fingerprint module is located, and the first position is located at the center of the two positions and extends along the length direction of the display screen.

24. The touch screen of any one of claims 16 to 22,

the fingerprint identification light source comprises a first light source, the display screen comprises a first position and a second position, the first position is opposite to the position where the first light source is located, the second position is opposite to the position where the optical fingerprint module is located, and the first position is located on one side of the position, extending along the length direction of the display screen, of the center of the two positions.

25. The touch screen of any one of claims 16 to 22,

the fingerprint identification light source comprises a second light source and a third light source, the display screen comprises a third position, a fourth position and a second position, the third position is opposite to the second light source, the fourth position is opposite to the third light source, the second position is opposite to the optical fingerprint module, and the third position and the fourth position are arranged on two sides of the position, extending along the length direction of the display screen, of the center position of the second position.

26. An electronic device characterized by comprising an optical fingerprint detection apparatus according to any one of claims 1 to 15.

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