WO2021213005A1

WO2021213005A1 - Electronic device

Info

Publication number: WO2021213005A1
Application number: PCT/CN2021/078088
Authority: WO
Inventors: 吴安平
Original assignee: Oppo广东移动通信有限公司
Priority date: 2020-04-20
Filing date: 2021-02-26
Publication date: 2021-10-28
Also published as: CN111399271A

Abstract

An electronic device (100). The electronic device (100) comprises a display module (10), a first optical filter (20), and a fingerprint sensor (30). The display module (10) comprises a liquid crystal layer (11) and a backlight module (12) which are laminated; the first optical filter (20) is disposed on the side of the backlight module (12) opposite to the liquid crystal layer (11) in a stacked mode, and the first optical filter (20) is used for reflecting visible light and transmitting light having a preset wavelength; the fingerprint sensor (30) is disposed on the side of the first optical filter (20) opposite to the backlight module (12), and the fingerprint sensor (30) is used for sensing the light having the preset wavelength to form fingerprint data.

Description

Electronic device

Priority information

This application requests the priority and rights of the patent application with the patent application number 202010313009.3 filed with the State Intellectual Property Office of China on April 20, 2020, and the full text is incorporated herein by reference.

Technical field

This application relates to the field of electronic technology, and in particular to an electronic device.

Background technique

The electronic device can use the fill light to emit infrared light, so that the infrared light is reflected by the finger and transmitted through the liquid crystal display screen to image the fingerprint sensor located under the liquid crystal display screen, so as to realize the under-screen fingerprint recognition of the electronic device.

Summary of the invention

This application discloses an electronic device.

The electronic device of the present application includes a display module, a first filter, and a fingerprint sensor; the display module includes a laminated liquid crystal layer and a backlight module; the first filter is stacked on the backlight module On the side opposite to the liquid crystal layer, the first filter is used to reflect visible light and transmit light of a predetermined wavelength; the fingerprint sensor is arranged on the opposite side of the first filter and the backlight module On one side, the fingerprint sensor is used to sense the predetermined wavelength light to form fingerprint data.

The additional aspects and advantages of the present application will be partly given in the following description, and part of them will become obvious from the following description, or be understood through the practice of the present application.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

FIG. 1 is a schematic plan view of an electronic device according to an embodiment of the present application;

2 is a schematic cross-sectional view of an electronic device according to an embodiment of the present application;

FIG. 3 is a partial enlarged schematic diagram of an electronic device according to an embodiment of the present application;

Fig. 4 is a schematic plan view of a fingerprint sensor according to an embodiment of the present application;

FIG. 5 is another schematic cross-sectional view of the electronic device according to the embodiment of the present application;

6 is another schematic cross-sectional view of the electronic device according to the embodiment of the present application;

FIG. 7 is another schematic cross-sectional view of the electronic device according to the embodiment of the present application.

FIG. 8 is another schematic plan view of the electronic device according to the embodiment of the present application;

FIG. 9 is another schematic plan view of the electronic device according to the embodiment of the present application;

FIG. 10 is another schematic plan view of the electronic device according to the embodiment of the present application;

FIG. 11 is a partial enlarged schematic diagram of a fingerprint sensor according to an embodiment of the present application;

FIG. 12 is a partial schematic diagram of a pixel array and a micro lens array according to an embodiment of the present application;

FIG. 13 is another schematic cross-sectional view of the electronic device according to the embodiment of the present application;

FIG. 14 is a filter characteristic diagram of the first filter and the third filter according to the embodiment of the present application;

FIG. 15 is a filter characteristic diagram of the second filter according to the embodiment of the present application.

Symbol description of main components:

Electronic device 100, display module 10, liquid crystal layer 11, backlight module 12, brightness enhancement film 121, diffusion film 122, light guide plate 123, frame 124, through hole 1231, cover plate 13, first filter 20, fingerprint Sensor 30, sensing chip 31, third filter 32, pixel array 33, pixel 331, micro lens array 34, micro lens 341, wiring layer 35, light hole 351, second filter 40, supplementary light The lamp 50, the flexible circuit board 60, the bracket 70, and the housing 80.

Detailed ways

The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The following embodiments described with reference to the drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation to the present application.

In the related art, in order to increase the screen-to-body ratio of electronic devices such as mobile phones, the fingerprint sensor can be arranged under the screen of the electronic device such as mobile phones, and ambient light will pass through the screen and be sensed by the fingerprint sensor.

It is understandable that ambient light or sunlight contains many different wavelengths of light, which can reach the fingerprint sensor after passing through the screen, causing noise in the fingerprint recognition image generated by the fingerprint sensor, which affects the efficiency of fingerprint recognition.

Referring to FIGS. 1-3, the electronic device 100 of the embodiment of the present application includes a display module 10, a first filter 20, and a fingerprint sensor 30. The display module 10 includes a laminated liquid crystal layer 11 and a backlight module 12. The first filter 20 is stacked on the back side of the backlight module 12 and the liquid crystal layer 11, and the first filter 20 is used to reflect visible light and transmit light of a predetermined wavelength. The fingerprint sensor 30 is arranged on the side of the first filter 20 opposite to the backlight module 12, and the fingerprint sensor 30 is used to sense light of a predetermined wavelength to form fingerprint data.

In the above electronic device 100, the first filter 20 can reflect the visible light K and transmit the light L of a predetermined wavelength, so that the fingerprint sensor 30 does not sense the visible light K, but can sense the light L of the predetermined wavelength, thereby improving the fingerprint sensor 30. According to the imaging quality of the predetermined wavelength light L, the fingerprint recognition efficiency of the electronic device 100 is improved. In addition, the reflected visible light K can pass through the liquid crystal layer 11 to improve the display quality of the liquid crystal layer 11.

It can be understood that both the display module 10 and the first filter 20 can transmit light L of a predetermined wavelength, so that the fingerprint sensor 30 can sense the light L of the predetermined wavelength to obtain fingerprint data.

Specifically, referring to FIG. 3, the backlight module 12 may include a laminated brightness enhancement film 121, a diffusion film 122, a backlight light source 123, and a light guide plate 124. The first filter 20 is disposed on the side of the light guide plate 124 away from the brightness enhancement film. , The visible light K emitted by the backlight light source and in the environment can be reflected to improve the display quality of the liquid crystal layer 11.

Generally, the range of the wavelength of light that the filter allows to pass through can be referred to as the pass width.

In the embodiment of the present application, the wavelength of the light that makes the fingerprint sensor 30 the best imaging quality is 940 nm. Therefore, the light that passes through the first filter 20 is mainly or only light with a wavelength of 940 nm, which can improve the fingerprint sensor. 30 The quality of the fingerprint recognition image obtained.

It is very difficult to make the light passing through the first filter 20 only 940nm. Therefore, the passing wavelength of the first filter 20 can be narrowed, and the center wavelength of 940nm can be used to make the light of 940nm wavelength pass through. The light of the first filter 20 occupies most of the light. In this way, the proportion of light outside the 940nm wavelength to the total light passing through the first filter 20 can be reduced, the proportion of the 940nm wavelength light sensed by the fingerprint sensor 30 can be increased, the noise on the fingerprint recognition image can be reduced, and the fingerprint can be improved. Identify the quality of the image, thereby improving the fingerprint unlocking rate.

Therefore, in the embodiment of the present application, a narrow-band filter with a narrower wavelength is selected as the first filter 20, or in other words, the first filter 20 is a narrow-band filter.

Please refer to FIG. 14. FIG. 14 shows the filtering characteristics of the first filter 20. As can be obtained from FIG. 14, the first filter 20 allows light with a certain wavelength with a center wavelength of 940 nm to pass.

Please continue to refer to FIG. 2, the light a illuminates the electronic device 100, and the light a passes through the display module 10 to reach the first filter 20, and the first filter 20 transmits the light L of a predetermined wavelength and reflects the visible light K. The fingerprint sensor senses the predetermined wavelength light L and generates a fingerprint recognition image, the visible light is reflected and deflected in the liquid crystal layer 11, so that the display module 10 displays the image.

It should be pointed out that in addition to reflecting the visible light K, the first filter 20 also reflects invisible light outside the predetermined wavelength of light L. The reflected invisible light does not affect the display effect of the display module 10. Therefore, in this embodiment Not much to repeat.

Please refer to FIGS. 2 and 3. In some embodiments, the electronic device 100 includes a second filter 40. The second filter 40 and the liquid crystal layer 11 are laminated and arranged, and the second filter 40 is used to transmit visible light K and the predetermined wavelength light L.

In this way, the second filter 40 can preprocess the light incident on the display module 10, filter or cut off the visible light K and the predetermined wavelength light L, and reduce the predetermined wavelength incident on the first filter 20. The invisible light K outside the external light improves the quality of the fingerprint image sensed by the fingerprint sensor.

In the implementation of the present application, a narrow band pass filter can be used as the second filter 40 to transmit visible light K and light L of a predetermined wavelength, and reflect invisible light N outside the light L of predetermined wavelength.

Specifically, please refer to FIG. 15. FIG. 15 is a filter characteristic diagram of the second filter 40. It can be seen from FIG. 15 that the second filter 40 allows light with a wavelength below 780 nm and a wavelength close to 940 nm to pass.

Please continue to refer to FIG. 3, the light a irradiates the electronic device 100. When the light a irradiates the second filter 40, the second filter 40 transmits the visible light K and the predetermined wavelength light L, and reflects the light outside the predetermined wavelength L. Visible light N.

Please refer to FIG. 3. In some embodiments, the second filter 40 is embedded between the liquid crystal layer 11 and the backlight module 12.

In this way, the second filter 40 can filter the light incident from the liquid crystal layer 11 toward the backlight module 12, so that the visible light K and the light outside the predetermined wavelength light L are filtered out, and the light incident on the first filter 20 is reduced. The environment interferes with light.

Specifically, the second filter 40 can cover the area on the corresponding side of the liquid crystal layer 11 and the backlight module 12, or in other words, the second filter covers the backlight module 12, so that all light incident through the liquid crystal layer 11 The visible light K and the invisible light N other than the predetermined wavelength light L are filtered out.

Referring to FIG. 4, in some embodiments, the fingerprint sensor 30 includes a sensing chip 31 and a third filter 32 covering the sensing chip. The third filter 32 is used to transmit light L of a predetermined wavelength, and the sensing chip 31 is used to sense light L of the predetermined wavelength to form fingerprint data.

In this way, other rays of light outside the predetermined wavelength of light L can be prevented from entering from the side of the electronic device 100 to be sensed by the fingerprint sensor 30, and the influence of other rays of light outside of the predetermined wavelength of light L on fingerprint data collection can be reduced.

Please continue to refer to FIG. 4, the light b illuminates the fingerprint sensor 30, the third filter 32 transmits the light L of a predetermined wavelength, and other light X outside the light L of the predetermined wavelength cannot pass through the third filter 32 and is reflected or cut off. The predetermined wavelength light L is imaged on the sensor chip 31, so that the fingerprint sensor 30 obtains a fingerprint recognition image.

It should be noted that the light b includes the light irradiated to the fingerprint sensor 30 through the display module 10 and the first filter 20, and also includes the light irradiated to the fingerprint sensor 30 from the side of the electronic device 100.

Specifically, the third filter 32 can also be a narrow-band filter, or in other words, the third filter 32 can be a narrow-band filter. Please refer to FIG. 14. FIG. 14 is also a filter characteristic diagram of the third filter 32. The third filter 32 allows light with a narrow wavelength with a center wavelength of 940 nm to pass.

Referring to FIGS. 5 and 6, in some embodiments, the electronic device 100 includes a fill light 50, and the fill light 50 is used to transmit light L of a predetermined wavelength through the display module 10.

In this way, the light L of the predetermined wavelength emitted by the fill light 50 can pass through the first filter 20 after being reflected by the finger, and the fingerprint sensor 30 can sense the light L of the predetermined wavelength, so that the electronic device 100 can obtain fingerprint data of the finger.

Specifically, the function of the fill light 50 is to provide the fingerprint sensor 30 with a light source for sensing fingerprint images. Generally, the predetermined wavelength light L emitted by the fill light 50 does not affect the display effect of the display module 10, that is, the fill light 50 emits invisible light, and the invisible light includes infrared light and ultraviolet light, and the fill light 50 usually emits It is infrared light. In this embodiment, the fill light 50 may be a light source capable of emitting light with a center wavelength of 940 nm.

1 and 4, in some embodiments, the fill light 50 and the fingerprint sensor 30 are arranged side by side.

In this way, the fill light 50 emits light L of the predetermined wavelength along the thickness direction of the electronic device 100, which can reduce the loss of the light L of the predetermined wavelength after being reflected by the finger, and increase the intensity of the light L of the predetermined wavelength sensed by the fingerprint sensor 30, thereby improving fingerprints. Identify the quality of the image.

Please refer to FIG. 6, in some embodiments, the fill light 50 is disposed on the side of the backlight module 10, and the central optical axis m of the fill light 50 is tilted toward the fingerprint sensor 30.

In this way, the fill light 50 arranged on the side of the backlight module 10 can be arranged inside the electronic device 100 to make the electronic device 100 more beautiful; at the same time, the predetermined wavelength light L can be emitted from the side, and after propagation, the predetermined wavelength light L can be A fingerprint recognition image is formed on the fingerprint sensor 30.

The central optical axis m of the fill light 50 arranged obliquely toward the fingerprint sensor 30, most of the predetermined wavelength light L emitted by the fill light 50 can be reflected by the user’s finger towards the fingerprint sensor 30, and then directed towards the fingerprint sensor 30 obliquely. There is a large difference in the propagation path of the ambient light, so as to facilitate the fingerprint sensor 30 to distinguish and obtain the predetermined wavelength light L and the ambient light, improve the quality of the fingerprint recognition image, and increase the fingerprint unlocking rate.

Specifically, referring to FIG. 6, the light-sensing light path h of the fingerprint sensor 30 is inclined from the fingerprint sensor 30 toward the fill light 20. The light-sensing light path h is a path for light L of a predetermined wavelength to enter the fingerprint sensor 30 after passing through the display module 10.

For more details, please refer to FIGS. 8-10. The arrangement of the fill light 50 and the fingerprint sensor 30 in the electronic device 100 can be any of those shown in FIGS. 8-10. Specifically, in FIG. 8, the fill light 50 is centrally arranged at the bottom of the electronic device 100, and the fingerprint sensor 30 is arranged at a position close to the bottom of the electronic device 100 and directly above the fill light 50. In FIG. 9, the position of the fingerprint sensor 30 is still unchanged in the position of FIG. 8, and the fill light 50 is provided on the left edge of the electronic device 100 corresponding to the fingerprint sensor 30. In FIG. 10, the position of the fingerprint sensor 30 is still unchanged in the position of FIG.

Referring to FIGS. 6, 11 and 12, in some embodiments, the fingerprint sensor 30 includes a pixel array 33 and a wiring layer 35 covering the pixel array 33. The wiring layer 35 is formed with a light-passing hole 351, and the sidewall of the light-passing hole 351 close to the light-filling lamp 50 is inclinedly arranged toward the light-filling lamp 50 so that the sensing light path is inclined toward the light-filling lamp 50.

In this way, the obliquely arranged light through hole 351 can tilt the sensing light path of the fingerprint sensor 30 toward the fill light 50, so that the light L of the predetermined wavelength emitted by the fill light 50 arranged on the side of the display module 10 can be used by the pixels. The array 33 is sensed, and at the same time, the entry of external interference light is reduced, so as not to affect the imaging of the fingerprint recognition image and improve the fingerprint unlocking rate.

Specifically, the pixel array 33 includes a plurality of pixels 331, and the pixels 331 can sense the predetermined values emitted by the fill light 50, penetrating through the cover 13, propagating through the fingers, and then penetrating the display module 10 and the first filter 20. The wavelength light L and the predetermined wavelength light L sensed by each pixel 321 are integrated, so that the fingerprint sensor 30 can obtain the overall fingerprint recognition image, thereby unlocking the electronic device 100.

There may be multiple light-passing holes 351 opened on the wiring layer 35, and each light-passing hole 351 can be provided with one or more pixels 331. In the embodiment of the present application, each light-passing hole 351 is provided with one pixel 331. .

The wiring layer 35 is made of a metal material. The wiring layer 35 can form interlaced wires. The wires are connected to each pixel 331 to transmit the signal of the pixel 331. For example, the pixel 331 forms an electrical signal after sensing light. The electrical signal can be output to the outside of the fingerprint sensor 30 through the wires of the wiring layer 35.

Specifically, the pixel 331 may be provided with a microlens 341 correspondingly, and the microlens 341 is used to converge light L of a predetermined wavelength, so as to improve the clarity of the fingerprint recognition image and improve the efficiency of fingerprint unlocking.

Please continue to refer to FIG. 11, the angle a in FIG. 11 represents the angular range within which each group of pixels 331 can obtain light L of a predetermined wavelength through the microlens 341 and the light-passing hole 351. With reference to FIG. 6, it can be known that the predetermined wavelength light L is emitted from the left side, and is sensed by the pixel 331 after propagating through the propagation path. Therefore, by controlling the size and distribution range of the angle a, the incident angle of the predetermined wavelength light L can be controlled to be separated from the incident angle of the infrared light in the ambient light, so that the infrared light in the ambient light is not sensed by the pixels 331. In order to reduce the noise in the fingerprint recognition image formed by the fingerprint sensor 30, the fingerprint unlocking rate is improved.

Furthermore, each microlens 341 may be provided with one or more pixels 331 correspondingly. In the embodiment of the present application, each microlens 341 is provided with a pixel 331 correspondingly, and each microlens 341 and pixel 331 is provided with a corresponding light-passing lens.孔351.

The microlens 341 has a positive refractive function. In the implementation of the present application, the surface of the microlens 341 away from the pixel 331 is a convex surface and faces the surface of the pixel. Of course, it can be understood that the microlens 341 may have other structures, as long as the microlens 341 condenses the light to the pixels 331.

Specifically, the center Y of each pixel 331 is offset from the center Z of the corresponding microlens 341. In this way, the predetermined wavelength light L emitted from the side and propagated by the fill light 50 provided on the side of the display module 10 can enter the fingerprint sensor 30 at an oblique angle, which improves the fingerprint sensor 30’s ability to receive the predetermined wavelength light L. At the same time, the flux of the infrared light from the ambient light irradiated from the vertical direction into the fingerprint sensor 30 can be reduced, so as to reduce the influence of the ambient light on the formation of the fingerprint recognition image, so as to improve the fingerprint unlocking rate.

The misalignment of the center of each pixel 331 and the microlens 341 may be: the center of the microlens 341 is shifted toward the direction of the fill light 50, so that more light L of the predetermined wavelength can be sensed by the pixel 331.

Please refer to FIG. 7, in some embodiments, the fingerprint sensor 30 is arranged obliquely toward the fill light 50.

In this way, the fingerprint sensor 30 is arranged obliquely toward the fill light 50, which increases the amount of light L obtained by the fingerprint sensor 30 of the predetermined wavelength, improves the quality of the fingerprint recognition image, and reduces the amount of infrared light obtained by the fingerprint sensor 30 in the ambient light. , Reduce the influence of infrared light in the ambient light on the imaging of fingerprint recognition images, and improve the fingerprint unlocking rate.

In addition, the pixels 331 can form a pixel array 33, and the pixel array 33 is arranged obliquely toward the fill light 50. In other words, the fingerprint sensor 30 is inclined toward the fill light 50 with respect to the horizontal direction.

In this way, the entire pixel array 33 is arranged obliquely toward the fill light 50, which increases the amount of light L obtained by the pixel array 33 of the predetermined wavelength, improves the quality of fingerprint recognition images, and at the same time reduces the amount of infrared light obtained by the pixel array 33 from ambient light. Reduce the influence of infrared light in the ambient light on the imaging of fingerprint recognition images, and improve the fingerprint unlocking rate.

Specifically, the pixel array 33 may correspond to a microlens array 34, and the microlens array 34 is used to converge light L of a predetermined wavelength. The microlens array 34 can be arranged in parallel with the pixel array 33. Therefore, the microlens array 34 is also arranged obliquely toward the fill light 50.

Please refer to FIG. 13. In some embodiments, the display module 10 further includes a cover 13. The liquid crystal layer 11 is located between the backlight module 12 and the cover 13. The fill light 50 is arranged on the side of the backlight module 12, and the fill light 50 is used to transmit light L of a predetermined wavelength through the cover 13. The fingerprint sensor 30 is used for sensing light L of a predetermined wavelength that sequentially passes through the cover 13, the liquid crystal layer 11 and the backlight module 12.

In this way, the fill light 50 arranged on the side of the backlight module 12 can be arranged inside the electronic device 100 and can emit light L of a predetermined wavelength from the side. After propagation, the light L of the predetermined wavelength forms a fingerprint recognition image on the fingerprint sensor 30 .

Specifically, the light fill lamp 50 is arranged under the cover plate 13. It can be understood that the cover plate 13 is a component with high light transmission, and the fill light lamp 50 directly emits light through the cover plate 13, so as to reduce the loss of light. Improve the accuracy of fingerprint sensor 30 recognition.

Please refer to FIG. 6. In some embodiments, the backlight module 12 further includes a frame 124. The fingerprint sensor 30 is arranged on the outside of the frame 124. The frame 124 is provided with a through hole 1241 corresponding to the fingerprint sensor 30. The fingerprint sensor 30 is used to penetrate the cover 13, the liquid crystal layer 11, the backlight module 12, and the through hole 1241. Detect light L of a predetermined wavelength.

In this way, the through hole 1241 can allow the light L of the predetermined wavelength emitted by the fill light 50 to pass through the opaque frame 124 to form a fingerprint recognition image on the fingerprint sensor 30.

Specifically, the frame body 124 may be a metal frame or a flat plate shape. The frame 124 is used to protect the first filter 20. The fact that the fingerprint sensor 30 is arranged on the outside of the frame 124 means that the fingerprint sensor 30 is arranged on the side of the frame 111 away from the first filter 20.

Furthermore, the number of through holes 1241 opened in the frame body 124 may be one or more. In the embodiment of the present application, the number of the through hole 1111 is one.

The cross-sectional shape of the through hole 1241 may be a square, a circle, or other patterns. In the embodiment of the present application, the shape of the through hole 1241 is square. In this way, the gap between the hole and the hole can be reduced, so as to increase the throughput of the predetermined wavelength light L as much as possible in a limited area.

Please refer to FIG. 6. In some embodiments, the electronic device 100 includes a flexible circuit board 60 connected to the fingerprint sensor 30 and the fill light 50.

In this way, the flexible circuit board 60 can be connected to control the fingerprint sensor 30 and the supplementary light 50, so that the fingerprint sensor 30 and the supplementary light 50 are connected and cooperated with each other, and the fingerprint unlocking efficiency is improved.

Specifically, the flexible circuit board 60 can simply control the fingerprint sensor 30 and the fill light 50. When the fingerprint recognition image acquired by the fingerprint sensor 30 is unqualified, the flexible circuit board 60 controls the fill light 50 to be turned on all the time. 50 always emits light L of a predetermined wavelength, so that the fingerprint sensor 30 continuously obtains the fingerprint identification image until the fingerprint identification image reaches the standard, and then the light-filling lamp 50 is controlled to turn off through the flexible circuit board 60.

6 and 7, the shape of the flexible circuit board 60 can be changed according to the orientation of the fill light 50 and the fingerprint sensor 30, the bottom of the fill light 50 and the fingerprint sensor 30 can be connected to the flexible circuit board 60, and The fill light 50 and the fingerprint sensor 30 are fixed on the flexible circuit board 60 to ensure that the circuit connection will not be broken.

Referring to FIG. 13, in some embodiments, the electronic device 100 includes a bracket 70, and the fill light 50 is fixed on the bracket 70 through a flexible circuit board 60. In this way, the bracket 70 can securely install the fill light 50 on the electronic device 100. Specifically, the electronic device 100 may include a housing 80, and the bracket 50 may be fixed on the housing 80 by means of hot melt glue, threaded fasteners, buckles, or the like.

Please continue to refer to FIG. 13, the bracket 70 includes two sections of flat plates that form a certain angle. The first flat plate 71 is fixed to the housing 80 by threaded fasteners. The second flat plate 72 and the fill light 50 face in the same direction to make the fill light 50 and the flexible circuit board 60 can be mounted on the bracket 70.

The fill light 50 and the flexible circuit board 60 can be fixed on the bracket 70 by means of hot melt glue, threaded fasteners, buckles, or the like. In the embodiment of the present application, the fill light 50 and the flexible circuit board 60 are fixed on the bracket 70 by threaded fasteners, and the flexible circuit board 60 is fixed between the fill light 50 and the bracket 70.

In some embodiments, the predetermined wavelength light L has a wavelength range of 935-945 nm.

In this way, the predetermined wavelength light L with a narrower wavelength can pass through the first filter 20 smoothly, so that the fingerprint sensor 30 can sense enough predetermined wavelength light L to obtain fingerprint data of better quality.

Specifically, the fill light 50 may use a laser fill light. The laser fill light emits light with high intensity and relatively concentrated wave width, and can emit laser light with a center wavelength of 940 nm and a wave width of less than 10 nm. The energy of light with a wavelength of 940 nm can be increased, and the fingerprint image formed by the fingerprint sensor 30 that can sense light with a wavelength of 940 nm after sensing the fingerprint data becomes clearer.

In the electronic device 100 of the present application, when the user's finger touches the fingerprint to unlock the corresponding area, the fill light 50 emits a predetermined wavelength light L with a center wavelength of 940 nm and a wavelength width of 10 nm or less. The predetermined wavelength light L passes through the display module 10 and is reflected by the finger, passes through the second filter 40, the first filter 20, and the third filter 32 in sequence, and finally the predetermined wavelength light L with fingerprint information enters The fingerprint sensor 30 forms a fingerprint recognition image in the fingerprint sensor. Among them, the first filter 32, the second filter 20, and the third filter 32 can pass the predetermined wavelength light L at different stages to filter the light used for fingerprint unlocking that is propagated in the electronic device 100 multiple times. The proportion of interference light in the predetermined wavelength light L sensed by the fingerprint sensor 30 is minimized, the quality of the fingerprint recognition image is improved, and the fingerprint unlocking efficiency is improved.

The above examples only express a few implementations of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can be made, and these all fall within the protection scope of this application. Therefore, the scope of protection of the patent of this application shall be subject to the appended claims.

Claims

An electronic device, characterized in that it comprises:

A display module, the display module includes a laminated liquid crystal layer and a backlight module;

The first filter is laminated and arranged on the opposite side of the backlight module and the liquid crystal layer, and the first filter is used to reflect visible light and transmit light of a predetermined wavelength; and

The fingerprint sensor is arranged on the side of the first light filter opposite to the backlight module, and the fingerprint sensor is used for sensing the light of the predetermined wavelength to form fingerprint data.
The electronic device according to claim 1, wherein the electronic device comprises a second filter, the second filter and the liquid crystal layer are stacked and arranged, and the second filter is used to transmit Through visible light and the predetermined wavelength light.
3. The electronic device of claim 2, wherein the second filter is embedded between the liquid crystal layer and the backlight module.
4. The electronic device of claim 3, wherein the second filter covers the backlight module.
The electronic device according to claim 2, wherein the second filter allows light with a wavelength below 780 nm to pass.
The electronic device according to claim 1, wherein the fingerprint sensor comprises a sensing chip and a third filter covering the sensing chip, and the third filter is used to pass through the predetermined Wavelength light, the sensor chip is used to sense the predetermined wavelength light to form the fingerprint data.
The electronic device according to claim 6, wherein the third filter 32 is a narrowband filter.
4. The electronic device according to claim 1, wherein the electronic device comprises a supplementary light, and the supplementary light is used to transmit the light of the predetermined wavelength through the display module.
8. The electronic device according to claim 8, wherein the fill light and the fingerprint sensor are arranged side by side.
8. The electronic device according to claim 8, wherein the fill light is arranged on a side of the backlight module, and a central optical axis of the fill light is inclined toward the fingerprint sensor.
8. The electronic device according to claim 8, wherein the fill light is arranged inside the electronic device.
8. The electronic device according to claim 8, wherein the fill light is centrally arranged on the bottom or left edge or right edge of the electronic device.
11. The electronic device according to claim 10, wherein the fingerprint sensor is arranged obliquely toward the fill light.
The electronic device according to claim 13, wherein the fingerprint sensor comprises a pixel array and a wiring layer covering the pixel array, and the wiring layer is formed with a light-passing hole close to the fill light The side wall of the light-through hole is inclinedly arranged toward the light supplement lamp.
The electronic device according to claim 14, wherein the pixel array comprises a plurality of pixels, the light-passing hole has a plurality, and each of the light-passing holes is correspondingly provided with one or more pixels.
The electronic device according to claim 15, wherein the pixel 331 is correspondingly provided with a microlens, and the microlens is used to condense light of a predetermined wavelength.
8. The electronic device according to claim 8, wherein the electronic device comprises a flexible circuit board connected to the fingerprint sensor and the fill light.
9. The electronic device according to any one of claims 1-9, wherein the predetermined wavelength light has a wavelength of 935-945 nm.
An electronic device, characterized in that it comprises:

A display module, the display module includes a laminated liquid crystal layer and a backlight module;

The first filter is laminated and arranged on the side opposite to the liquid crystal layer of the backlight module, the first filter is a narrow band filter, and the first filter is used to reflect visible light and transmit Light passing a predetermined wavelength; and

The fingerprint sensor is arranged on the side of the first light filter opposite to the backlight module, and the fingerprint sensor is used for sensing the light of the predetermined wavelength to form fingerprint data.
An electronic device, characterized in that it comprises:

A display module, the display module includes a laminated liquid crystal layer, a backlight module and a cover plate, the liquid crystal layer is located between the backlight module and the cover plate;

The first filter is laminated and arranged on the side opposite to the liquid crystal layer of the backlight module, the first filter is a narrow band filter, and the first filter is used to reflect visible light and transmit Light passing a predetermined wavelength; and

The fingerprint sensor is arranged on the side of the first light filter opposite to the backlight module, and the fingerprint sensor is used for sensing the light of the predetermined wavelength to form fingerprint data.