CN211698979U

CN211698979U - Sensing module and electronic equipment

Info

Publication number: CN211698979U
Application number: CN202020015790.1U
Authority: CN
Inventors: 朱文龙; 林峰
Original assignee: Shenzhen Fushi Technology Co Ltd
Current assignee: Shenzhen Fushi Technology Co Ltd
Priority date: 2019-04-23
Filing date: 2020-01-03
Publication date: 2020-10-16
Anticipated expiration: 2030-01-03

Abstract

This application is applicable to optics and electron technical field, provides this application embodiment and provides an electronic equipment, and it includes: a display device for displaying a picture; the cover plate is arranged on the display surface of the display device, the position of the cover plate corresponding to at least one side edge of the display device extends outwards continuously to form a part which exceeds the display device, and the cover plate is provided with a sensing area used for sensing an external object in the area corresponding to the display device; the first film layer is arranged on the part of the cover plate exceeding the display device, and the first film layer can penetrate infrared light or near infrared light; and the emission unit is used for emitting sensing light to the part of the external object in the sensing region through the first film layer for sensing.

Description

Sensing module and electronic equipment

Technical Field

The application belongs to the technical field of optics, especially relates to a sensing module and electronic equipment.

Background

The existing electronic equipment often needs to set a functional module on a main viewing surface in order to realize multiple functions, for example: in order to wake up the electronic device using the fingerprint recognition function, a fingerprint recognition module is required to be arranged on the main viewing surface of the electronic device. However, in order not to affect the display function of the electronic device, these functional modules generally need to be separately disposed outside the display area of the main viewing surface of the electronic device, so as to occupy the display area of the electronic device, which affects the overall appearance of the main viewing surface of the electronic device.

SUMMERY OF THE UTILITY MODEL

The application provides a sensing module and an electronic device to solve the technical problem.

An embodiment of the present application provides an electronic device, which includes:

a display device for displaying a picture;

the cover plate is arranged on the display surface of the display device, the position of the cover plate corresponding to at least one side edge of the display device extends outwards continuously to form a part which exceeds the display device, and the cover plate is provided with a sensing area used for sensing an external object in the area corresponding to the display device;

the first film layer is arranged on the part of the cover plate, which exceeds the display device; and

and the emission unit is used for emitting sensing light through the first film layer to irradiate the part of the external object in the sensing region for sensing, and the first film layer can transmit the sensing light but not transmit visible light.

In some embodiments, a projection area of the emission unit on the cover plate and a projection area of the display panel on the cover plate do not intersect with each other.

In some embodiments, the emission unit and the display panel do not overlap with each other in a direction perpendicular or substantially perpendicular to a display surface of the display panel.

In some embodiments, the emission unit is disposed below a portion of the cover plate beyond the display device.

In some embodiments, the light intensity of the sensing light formed on the external object in at least part of the sensing region by the emission unit is non-uniformly distributed.

In some embodiments, the non-uniform distribution of illuminance refers to a difference of illuminance of more than 30% in a range of 7-10 microns in average interval.

In some embodiments, the ratio of the area of the region formed by the emission unit on the sensing region and having non-uniform illuminance distribution to the total area of the sensing region needs to be equal to or greater than one third.

In some embodiments, the emitting unit includes one or more light emitting elements, and the plurality of light emitting elements simultaneously emit sensing light to the sensing region; or

The plurality of light emitting elements are divided into different combinations according to a preset rule, the light emitting elements belonging to the same combination simultaneously emit sensing light to the sensing area, and the light emitting elements of the different combinations respectively emit the sensing light to the sensing area in different time periods.

In some embodiments, the proportion of the area of the mutually overlapped portions of the light emitting elements symmetrically distributed about the center of the sensing region forming the respectively formed illumination regions in the sensing region to the total area of the sensing region should be less than two thirds.

In some embodiments, the emission unit includes two pairs of light emitting devices symmetrically distributed about a center of the sensing region, wherein a pair of light emitting devices symmetrically distributed about the center of the sensing region closer to the sensing region is divided into a first light emitting device group, a pair of light emitting devices symmetrically distributed about the center of the sensing region farther from the sensing region is divided into a second light emitting device group, the first light emitting device group and the second light emitting device group emit the sensing light to the sensing region within different time periods, and illumination regions respectively formed by the sensing light emitted by the light emitting devices in the same group at the same time do not overlap in the sensing region.

In some embodiments, the display device includes a display panel and a backlight module disposed below the display panel for providing backlight light to the display panel.

In some embodiments, the display device further comprises a receiving unit disposed below the display device to receive the sensing light reflected by the external object through the display device.

In some embodiments, the sensing light is infrared or near-infrared light with a wavelength ranging from 750 nm to 2000 nm.

In some embodiments, the sensing light transmittance refers to a transmittance of the first film layer to the sensing light of 70% or more, and the visible light non-transmittance refers to a transmittance of the first film layer to the visible light of 10% or less.

The embodiment of the application provides a sensing module, which is applied to an electronic device with a cover plate and a display device. The cover plate is arranged on the display surface of the display device and is provided with a sensing area used for sensing an external object. The position of the cover plate corresponding to at least one side edge of the display device extends outwards continuously to form a part which exceeds the display device. The sensing module comprises an emitting unit for emitting sensing light and a receiving unit for receiving the sensing light. The part of the cover plate, which exceeds the display device, is provided with a first film layer which can be used for transmitting sensing light and not transmitting visible light. The emission unit emits sensing light through the first film layer and the cover plate to irradiate the part of the external object in the sensing area for sensing. The receiving unit receives sensing light returned by an external object through the display device so as to sense the external object.

The embodiment of the application can transmit and/or receive sensing light to realize the sensing function in the display area of the display device by arranging the base used for bearing the transmitting unit and the receiving unit below the display device, does not need to occupy the area of the display area of the electronic equipment, is favorable for improving the screen occupation ratio of the electronic equipment, and improves the overall impression of the main viewing surface of the electronic equipment. In addition, the sensing module forms a region with non-uniform illuminance distribution in the sensing region by reasonably setting the light emitting region and the light emitting period of the light emitting element, so that luminous fluxes of sensing light reflected back by different parts on an external object have obvious differences, a high-contrast clear light and dark image can be formed, and the sensing accuracy is improved.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the present application.

Drawings

Fig. 1 is a schematic front view of an electronic device provided in an embodiment of the present application, where the electronic device includes a sensing module located below a display device.

Fig. 2 is a left side view of the electronic device in fig. 1, viewed from the left side in the horizontal direction I.

Fig. 3 is a schematic bottom view of the electronic device in fig. 2, as viewed from the bottom in the vertical direction II.

Fig. 4 is a schematic diagram of the variation of the light emission intensity with the light emission angle of the light emitting element of the electronic device shown in fig. 1.

Fig. 5 is a schematic view of illuminance distribution when a plurality of light emitting elements shown in fig. 4 are symmetrically distributed and the respective irradiation regions overlap.

Fig. 6 is a schematic view of illuminance distribution of the light emitting elements of the electronic device in fig. 1 in the sensing region.

Fig. 7 is a left side view configuration diagram of an electronic device according to a modified embodiment of the present application.

Fig. 8 is a left side view configuration diagram of an electronic device according to a modified embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application. In the description of the present application, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any order or number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; either mechanically or electrically or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship or combination of two or more elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The following disclosure provides many different embodiments or examples for implementing different structures of the application. In order to simplify the disclosure of the present application, only the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repeat use is intended to provide a simplified and clear description of the present application and is not intended to suggest any particular relationship between the various embodiments and/or arrangements discussed. In addition, the various specific processes and materials provided in the following description of the present application are only examples of implementing the technical solutions of the present application, but one of ordinary skill in the art should recognize that the technical solutions of the present application can also be implemented by other processes and/or other materials not described below.

Further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject technology can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of the application.

One embodiment of the present application provides an electronic device 1, for example: mobile phones, notebook computers, tablet computers, touch interactive screens, doors, vehicles, robots, automatic numerical control machines, and the like. Referring to fig. 1 and fig. 2 together, fig. 1 is a schematic structural diagram of a main view of the electronic device 1, and fig. 2 is a schematic structural diagram of a left view of the electronic device 1 in fig. 1 from the left side to the right side along a horizontal direction I. The electronic device 1 includes a cover plate 10, a display device 12 and a sensing module 14. The cover plate 10 is disposed on a side surface of the display device 12 for displaying light emission. The sensing module 14 is disposed at least partially under the display device 12 to sense an external object through the display device 12 and the cover plate 10. The electronic device 1 can correspondingly execute corresponding functions according to the sensing result of the sensing module 14. The corresponding function includes but is not limited to unlocking after identifying the identity of the external object, paying, starting a preset application program, or acquiring physical function parameters such as heart rate and blood oxygen content of the external object to judge any one or more combinations of emotion and health condition of the external object.

The cover plate 10 may be an outermost layer of the electronic device 1, and is disposed on a surface of the display device 12 on a side for displaying light, so as to protect the display device 12. The cover plate 10 includes oppositely disposed upper and

lower surfaces

100 and 102. The upper surface 100 faces the outside of the electronic device 1 and is an outer surface of the electronic device 1. The lower surface 102 faces the display device 12 located below the cover plate 10. The upper surface 100 of the cover plate 10 may also be used to contact the external object, providing a sensing interface for sensing the external object. The cover plate 10 may be made of a transparent hard material. The material of the cover plate 10 may be, but is not limited to, glass, sapphire, plastic, etc.

The display device 12 includes a display panel 12. The display panel 120 is used to display an image. A small space omitted on the display surface of the display panel 120 for routing is basically the display area of the electronic device 1. The Display Panel 120 may be, but not limited to, a Liquid Crystal Display Panel (LCDPanel), an Organic Light Emitting Diode Display Panel (OLED Display Panel), a Micro-LED Display Panel (Micro-LED Display Panel), or a Mini-LED Display Panel (Mini-LED Display Panel). The display panel 120 is disposed on the lower surface 102 of the cover plate 10, and may be directly contacted with the lower surface 102 of the cover plate 10, or may be separated from the lower surface 102 of the cover plate 10 by a predetermined distance. For the non-self-luminous display panel 120, the backlight module 122 is disposed below the display panel 120 and is used for providing backlight light to the display panel 120. In this embodiment, the display panel 120 is a liquid crystal display panel.

The cover plate 10 has a shape corresponding to the display device 12. The cover plate 10 has a size larger than that of the display device 12 so that the cover plate 10 can cover the entire display device 12. The cover plate 10 extends outward beyond the display device 12 at a position corresponding to at least one side edge of the display device 12. In other words, the cover plate 10 extends outward from the projection of at least one side edge of the display device 12 on the cover plate 10 to form the portion beyond the display device 12. The portion of the cover 10 beyond the edge of the display device 12, which cannot be displayed due to the absence of the display panel 120, may be defined as a non-display area of the electronic apparatus 1. It is understood that the positions of the cover plate 10 corresponding to the peripheral edges of the display device 12 may extend outward to form a portion beyond the display device 12, that is, the peripheral edges of the electronic device 1 may be formed with a non-display area.

The electronic device 1 further comprises a first membrane layer 108. The first film layer 108 is disposed on at least a portion of the surface of the cover plate 10 beyond the display device 12, i.e., on at least a portion of the non-display area 106 of the cover plate 10, and may be the upper surface 100 or the lower surface 102 of the corresponding portion of the cover plate 10. The first film layer 108 has optical properties of transmitting infrared or near infrared light. Specifically, the first film layer 108 transmitting infrared or near infrared refers to the first film layer 108 having a transmittance of infrared or near infrared light of greater than or equal to 70%. The infrared or near infrared wavelength range is 750 nanometers (nm) to 2000 nm. The first film layer 108 may be disposed on the entire area of the cover plate 10 beyond the portion of the display device 12, i.e., the entire non-display area of the cover plate 10. The first film layer 108 may also be disposed on one or more areas of the cover sheet 10 that extend beyond the display device 12. For example: the first film layer 108 is disposed at one or more regions of the cover plate 10 beyond the display device 12 that are required for emitting the sensing light to the external object, i.e., one or more regions of the cover plate 10 that are required for emitting the sensing light to the external object in the non-display region. It is understood that the first film layer 108 may also have optical properties that are opaque to visible light. The optical characteristic of the opaque visible light may be that the opaque visible light has a high reflectivity or can absorb visible light well, so that external visible light cannot enter the lower portion of the cover plate 10 through the first film layer 108, the visible light coming from the lower portion of the cover plate 10 cannot be transmitted, and the region of the cover plate 10 where the first film layer 108 is disposed is in a non-transparent state. Specifically, the first film layer 108 is opaque to visible light, which means that the transmittance of the first film layer 108 to visible light is less than or equal to 10%. In this embodiment, the first film layer 108 may be, but is not limited to, an infrared transmissive ink.

The display device 12 may also include a second film layer 112. The second film layer 112 may have only optical characteristics that are opaque to visible light. If the first film layer 108 is disposed on a portion of the cover 10 that extends beyond the display device 12, the second film layer 112 may be disposed on other portions of the cover 10 that extend beyond the display device 12 that are not disposed with the first film layer 108.

The sensing module 14 includes a transmitting unit 140 and a receiving unit 142. The emitting unit 140 is used for emitting sensing light to irradiate the external object for sensing. In the present embodiment, an example is given by taking an external object as a finger of a user, a partial surface of the finger having a fingerprint pattern is in contact with the cover plate 10, and the sensing light is returned by the finger and then received by the receiving unit 142 for sensing of fingerprint identification. The receiving unit 142 is disposed below the backlight module 122 to receive the sensing light returned by the finger through the cover plate 10, the backlight module 122 and the display panel 120. Here, the sensing light returning from the finger may be the sensing light reflected from the surface of the finger with the fingerprint pattern, or the sensing light entering the inside of the finger and then being emitted from the surface of the finger with the fingerprint pattern through diffuse reflection and propagation to return. Because the receiving unit 142 is disposed below the backlight module 122 and the display panel 120 and can receive the sensing light through the backlight module 122 and the display panel 120, it is not necessary to occupy the area of the main viewing surface of the electronic device 1, which is beneficial to improving the screen occupation ratio of the electronic device 1. In this embodiment, the sensing light may be infrared or near-infrared light with a wavelength ranging from 750 nanometers (nm) to 2000 nm.

It is understood that in other modified embodiments, the external object may not be in contact with the cover plate 10, and the sensing light irradiates the external object through the cover plate 10 for sensing. The sensing light may not carry the biometric information of the external object, and may be directly used for sensing the proximity of the external object. For example: the receiving unit 142 of the sensing module 14 senses that the sensing light exceeding the preset threshold returns, and then it is determined that an external object is close to the electronic device 1.

The receiving unit 142 is disposed below the display panel 120, so that the projection of the receiving unit 142 on the display panel 120 and the cover plate 10 is located in the display area of the electronic device 1. The area where the cover plate 10 intersects with the light path of the receiving unit 142 for receiving the sensing light is defined as a sensing region 105. It is understood that the range size of the sensing region 105 is determined by the field angle range of the receiving unit 142, and is not completely equal to the size of the receiving unit 142. The sensing region 105 may not face the receiving unit 142, and the sensing light transmitted from the sensing region 105 may be guided to the receiving unit 142 by disposing an optical element. The sensing light returned by the finger is transmitted from the sensing region 105 through the display panel 120 and the backlight module 122 and received by the receiving unit 142. The area of the display panel 120 corresponding to the sensing area 105 of the cover plate 10 is defined as an indication area 123, for example: the indication area 123 is a projection area of the sensing area 105 on the display panel 120. It is understood that in other variations, the indication area 123 may not directly face the sensing area 105.

Upon sensing, the display panel 120 may display a pattern of finger fingerprints on the indication area 123 to prompt the user to sense the location of the area 105. The user presses a finger into the sensing region 105 on the cover plate 10 for sensing of fingerprint recognition according to the prompt of the indication region 123.

The transmitting unit 140 is disposed below a portion of the cover 10 beyond the display device 12, i.e., below a portion of the cover 10 corresponding to the non-display area of the electronic apparatus 1. The emission unit 140 is located at a side of the display panel 120, including but not limited to a side-up side, a side-down side, and a front side. The emitting unit 140 and the display panel 120 do not overlap each other in a direction perpendicular or substantially perpendicular to the display surface of the display panel 120. In other words, the projection area of the emission unit 140 on the cover plate 10 and the projection area of the display panel 120 on the cover plate 10 do not intersect with each other.

It is understood that, in other modified embodiments, the emitting unit 140 may also be disposed below the backlight module 122 and emit the sensing light to the finger on the cover plate 10 through the backlight module 122 and the display panel 120.

The emission unit 140 includes one or more light emitting elements 146. The light emitting element 146 is used for emitting the sensing light. The Light Emitting element 146 may be a Light Emitting Diode (LED). The receiving unit 142 includes a lens 143 and an image sensor 145. The lens 143 focuses the returned sensing light on the image sensor 145 to form an image of fingerprint lines for fingerprint identification.

It is understood that in other modified embodiments, the light emitting element 146 may also be other types of light emitting sources, such as: an Organic Light Emitting Diode (OLED), a Vertical Cavity Surface Emitting Laser (VCSEL), a Laser Diode (LD), and any other suitable Light Emitting device. The receiving unit 142 may omit the lens 143, and directly perform imaging on the image sensor 145 by using the pinhole imaging principle. Alternatively, the receiving unit 142 does not need to be imaged when proximity sensing is performed, and the receiving unit 142 may use a Photodiode (PD) instead of the image sensor 145 for sensing.

The light emitting elements 146 may be asymmetrically distributed about the center of the sensing region 105. The light emitting elements 146 may also be symmetrically distributed about the center of the sensing region 105, including but not limited to rotational symmetry and central symmetry.

The cover plate 10 may extend outward to form a portion beyond the display panel 120 at a position corresponding to the peripheral edge of the display panel 120. Wherein, the partial area of the cover plate 10 beyond the edge of the display device 12 nearest to the sensing region 105 is defined as the emitting portion 106. The emitting unit 140 is disposed under the emitting part 106 of the cap plate 10. The first film layer is at least disposed corresponding to the light emitting element 146 of the emitting unit 140, that is, the first film layer 108 is disposed on the surface of the cover plate 10 beyond the display device 12 corresponding to the position of the light emitting element 146. The sensing light emitted from the light emitting device 146 is transmitted through the first film layer 108 and the cover plate 140 to irradiate the finger on the sensing region 105.

Specifically, taking the electronic device 1 as a mobile phone as an example, the sensing region 105 is disposed near the bottom edge of the mobile phone. The emitting portion 106 is the portion of the cover plate 10 that extends beyond the display device 12 at the bottom edge of the handset, commonly referred to in the industry as the "chin" portion of the handset. The entire emitting portion 106 of the cover plate 10 may be provided with the first film layer 108. The light emitting surface of the light emitting element 146 may be directly attached to the first film 108 disposed on the reflective portion 106, so that the emitted sensing light directly penetrates through the first film 108, thereby reducing the loss of the sensing light when entering the first film 108. The light emitting surface of the light emitting element 146 may also be spaced from the first film layer 108 by a certain distance, which is not specifically limited in this application.

It is understood that the first film layer 108 or the second film layer 112 may be disposed on the portion of the cover plate 10 beyond the other edges of the display device 12.

Taking the example where the external object is a finger, the fingerprint on the finger comprises valleys and ridges. The illuminance of the sensing light on the finger surface in at least a partial area of the sensing region 105 is non-uniformly distributed, so that the illuminance of the sensing light respectively on the protruding ridges and the recessed valleys on the fingerprint is different, and the light intensity of the sensing light emitted or reflected back through the valleys and the ridges to be received by the receiving unit 124 is obviously different. The receiving unit 124 can form clear light and dark stripes with high contrast corresponding to the valleys and ridges on the fingerprint, which is beneficial to subsequent fingerprint comparison and identification. In order to form a relatively clear stripe pattern of valleys and ridges, the difference of the illuminance of the sensing light irradiating the positions of the valleys and the ridges is more than 30%. The spacing between adjacent valleys and ridges on the fingerprint is in the range of 7-10 microns. Thus, the non-uniform distribution of the light intensity of the sensing light on the finger surface in at least a partial area of the sensing region 105 means that the difference of the light intensity on the adjacent valleys and ridges of the finger surface is greater than 30%, i.e. the difference of the light intensity is greater than 30% in the range of 7-10 microns apart on average.

The receiving unit 142 needs to acquire enough clear fingerprint images in the sensing region 105 for effective identification, so that the proportion of the area of the sensing region 105 with non-uniform illuminance, which is formed by the light emitting elements 146 on the sensing region 105, to the total area of the sensing region 105 needs to be equal to or greater than one third, so that at least one third of the fingerprint images formed in the sensing region 105 have high-contrast clear light and dark stripes for effective identification.

The one or more light emitting elements 146 on the emitting unit 140 may be simultaneously turned on to illuminate, or one or more of the light emitting elements 146 may be divided into different combinations according to a preset rule, the light emitting elements 146 belonging to the same combination emit sensing light to the sensing region 105 in the same time period, and the light emitting elements 146 of different combinations separately emit the sensing light to the sensing region 105 in different time periods. The illuminance of the sensing light in the sensing region 105 may be the illuminance of the single light emitting device 146 on the emitting unit 140, or the sum of the illuminance of the plurality of light emitting devices 146 lit in the same time period on the emitting unit 140.

Referring to fig. 1 and fig. 3 together, fig. 3 is a schematic bottom view of the electronic device 1 looking upward from the bottom along the vertical direction II. In this embodiment, the emission unit 140 includes two pairs of four light emitting elements 146. Each pair of light emitting devices 146 is symmetrically distributed about the center of the sensing region 105. The symmetrically distributed light emitting elements 146 are divided into different combinations according to their distances from the sensing region 105. Specifically, a pair of light emitting elements 146 that are closer to the sensing region 105 and symmetrically distributed about the center of the sensing region 105 are divided into a first group 1461 of light emitting elements, and a pair of light emitting elements 146 that are farther from the sensing region 105 and symmetrically distributed about the center of the sensing region 10 are divided into a second group 1462 of light emitting elements. The pair of light emitting elements 146 in the first light emitting element group 1461 simultaneously emit sensing light to the sensing region 105 in a first time period. The pair of light emitting elements 146 in the second light emitting element group 1462 simultaneously emit the sensing light to the sensing region 105 in the second time period. Different line shapes are used to schematically represent the sensing light emitted during different periods, such as: the sensing light emitted from the first light emitting element group 1461 is indicated by a solid line, and the sensing light emitted from the second light emitting element group 1462 is indicated by a broken line.

It is to be understood that, in other modified embodiments, the light emitting elements 146 may be divided and combined according to other principles, which is not limited in the present application.

In the case that different combinations of the light emitting elements 146 illuminate in different time periods, the receiving unit 142 can combine a plurality of images respectively formed by receiving the sensing light in different time periods into one image to extract feature points for comparison and identification. The receiving unit 142 may also analyze a plurality of images formed by receiving the sensing light in different periods to extract feature points from each image for comparison and identification.

It is understood that, in other modified embodiments, the receiving unit 142 may also perform other processing on the received sensing light to finally realize the function of comparison and identification, which is not limited in this application.

As shown in fig. 4, the light-emitting intensity of the sensing light emitted by the light-emitting element 146 varies with the light-emitting angle and has a predetermined light-emitting angle range, and the light emitted by the light-emitting element 146 along the direction with the maximum light-emitting intensity is defined as a principal light, and the light at the outermost boundary of the light-emitting angle range is defined as a boundary light. In this embodiment, the light emitting element 146 is an LED light source that emits infrared or near-infrared light. The light emitting angle of the light emitting element 146 ranges from 100 degrees to 160 degrees. The light emitting element 146 emits light from the center in the vertical direction with the maximum light intensity, and the light intensity gradually decreases with increasing angle from the center within the range of light emission angles. Therefore, the light emitted from the light emitting element 146 in the vertical direction from the center is defined as a principal ray, and the light with the light emitting angle of 120 degrees is defined as a boundary ray. It is understood that in other modified embodiments, the emission intensity of the light emitting element 146 may have other different distribution forms. Alternatively, the light emitting intensity distribution of the emitted light can be changed into various forms according to actual requirements by disposing a lens structure at the light emitting surface of the light emitting element 146.

As can be seen from the light intensity distribution characteristics of the light emitting devices 146, as shown in fig. 5, the illuminance of the plurality of irradiation regions correspondingly formed when the plurality of light emitting devices 146 symmetrically distributed about the center of the sensing region 105 simultaneously emit the sensing light is also symmetrically distributed about the center of the sensing region 105, so that the overlapping portions of the plurality of irradiation regions correspondingly formed by the plurality of light emitting devices 146 symmetrically distributed about the center of the sensing region 105 in the sensing region 105 are complemented by the illuminance of each other symmetrically distributed about the center of the sensing region 105, so that the overall illuminance of the overlapping portions is uniform, and the illuminance of the non-overlapping portions of the plurality of irradiation regions in the sensing region 105 is still gradually changed along with the irradiation angle. Therefore, when the plurality of light emitting devices 146 symmetrically distributed emit sensing light to the sensing region 105 in the same period, the ratio of the overlapping area of the plurality of illumination regions correspondingly formed in the sensing region 105 to the total area of the sensing region 105 should be less than two-thirds, so as to satisfy the requirement that the ratio of the area of the region with non-uniform illuminance distribution formed by the light emitting devices 146 on the sensing region 105 to the total area of the sensing region 105 is equal to or more than one third.

In the present embodiment, as shown in fig. 6, during sensing, the light emitting elements 146 belonging to the same combination are simultaneously turned on to emit sensing light to the sensing region 105, and the light emitting elements 146 belonging to different combinations are respectively turned on at different time intervals to emit sensing light to the sensing region 105. The illumination regions respectively and correspondingly formed when the light emitting elements 146 symmetrically distributed about the center of the sensing region 105 simultaneously emit the sensing light to the sensing region 105 do not overlap in the sensing region 105, and the illumination regions may be separated by a predetermined distance or have boundaries that are tangent to each other.

It is understood that the light emitting elements 146 of different combinations may be simultaneously turned on for illumination on the premise that the non-uniform illuminance distribution area formed in the sensing region 105 by each illumination occupies at least one third of the total area of the sensing region 105.

Referring to fig. 1 and fig. 6, in the present embodiment, the first light emitting element group 1461 and the second light emitting element group 1462 respectively perform irradiation in different time periods. The receiving unit 142 receives the sensing light returned by the external object in the irradiation period of the first light emitting element group 1461 to form a corresponding first sensing image. The receiving unit 142 receives the sensing light returned by the external object in the irradiation period of the second light emitting element group 1462 to form a corresponding second sensing image. The first sensing image and the second sensing image can be combined into one sensing image to extract feature points for comparison and identification, and can also be respectively used for extracting respective feature points for comparison and identification.

As shown in fig. 2, the upper surface 100 and the lower surface 102 of the cover plate 10 are parallel or substantially parallel to each other. The end face 107 of the end of the emitting part 106 of the cover plate 10 farthest from the sensing region 105 is perpendicular or approximately perpendicular to the upper surface 100 and the lower surface 102. The light emitting surface of the light emitting element 146 is also parallel or substantially parallel to the upper surface 100 of the sensing region 105. At this time, the principal ray of the light emitting element 146 is irradiated in a direction perpendicular or substantially perpendicular to the upper surface 100 of the cover plate 10.

It is understood that, in other modified embodiments, as shown in fig. 7, the light emitting surface of the light emitting element 146 may also form a predetermined angle θ with the upper surface 100 of the sensing region 105, and the predetermined angle θ ranges from 0 to 75 degrees.

As shown in fig. 8, in another modified embodiment, the end surface 107 of the end of the emitting portion 106 of the cover plate 10 farthest from the sensing region 105 is a slope forming a predetermined angle θ with the upper surface 100 of the cover plate 10, and the predetermined angle θ is greater than 0 degrees and less than 90 degrees. With such a structure, the main light ray with the maximum luminous intensity of the light emitting device 146 can be closer to the sensing region 105, so as to form a larger area with non-uniform illuminance distribution in the sensing region 105.

In the above embodiments, the light emitting elements 146 are all disposed on the same plane or on substantially the same horizontal plane. It is understood that, in other modified embodiments, the light emitting elements 146 may be located on different planes or different horizontal planes, which is not limited in the present application.

Electronic equipment 1 is through setting up sensing module 14 that can launch and/or receive sensing light in order to realize original sensing function in display area 103 of display device 12 below display device 12, need not occupy electronic equipment 1's display area 103 area, is favorable to improving electronic equipment 1's screen ratio, promotes the whole impression of electronic equipment 1 main viewing surface. In addition, the sensing module 14 forms a region with non-uniform illuminance distribution in the sensing region 105 by reasonably setting the light-emitting region and the light-emitting period of the light-emitting element 146, so that the luminous fluxes of the sensing light reflected back by different parts on the external object have obvious differences, a clear bright-dark image with high contrast can be formed, and the sensing accuracy is improved.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the present application, and any modifications, equivalents and improvements made within the spirit and principle of the present application are intended to be included within the scope of the present application.

Claims

1. An electronic device, comprising:

a display device for displaying a picture;

the first film layer is arranged on the part of the cover plate, which exceeds the display device;

the emission unit is used for emitting sensing light through the first film layer to irradiate the part of the external object in the sensing region for sensing, and the first film layer can transmit the sensing light but not transmit visible light; and

and the receiving unit is used for receiving the sensing light returned by the external object so as to obtain the fingerprint information of the external object.

2. The electronic device of claim 1, wherein: the projection area of the emission unit on the cover plate and the projection area of the display device on the cover plate do not intersect with each other.

3. The electronic device of claim 1, wherein: the light illuminance of the sensing light formed on the external object in at least partial area of the sensing region by the emission unit is non-uniformly distributed.

4. The electronic device of claim 3, wherein: the non-uniform distribution of the illuminance means that the illuminance difference is more than 30% in a range of 7-10 micrometers in average interval.

5. The electronic device of claim 3, wherein: the proportion of the area, in which the illuminance of the sensing region is non-uniformly distributed, formed by the emission unit on the sensing region to the total area of the sensing region needs to be equal to or greater than one third.

6. The electronic device of claim 3, wherein: the emitting unit comprises one or more light-emitting elements, and the light-emitting elements simultaneously emit sensing light to the sensing area; or

7. The electronic device of claim 6, wherein: the proportion of the area of the mutually overlapped parts of the irradiation regions formed in the sensing region by the light emitting elements symmetrically distributed about the center of the sensing region to the total area of the sensing region is less than two thirds.

8. The electronic device of claim 6, wherein: the emission unit comprises two pairs of light-emitting elements which are symmetrically distributed about the center of the sensing region, wherein the pair of light-emitting elements which are symmetrically distributed about the center of the sensing region and are close to the sensing region are divided into a first light-emitting element group, the pair of light-emitting elements which are symmetrically distributed about the center of the sensing region and are far away from the sensing region are divided into a second light-emitting element group, the first light-emitting element group and the second light-emitting element group respectively emit sensing light to the sensing region in different time periods, and irradiation regions which are formed by the sensing light emitted by the light-emitting elements in the same group at the same time respectively and correspondingly do not overlap in.

9. The electronic device of any of claims 1-8, wherein: the sensing light is infrared or near infrared light, and the wavelength range is 750 nanometers to 2000 nanometers.

10. A sensing module, its characterized in that: the sensing module comprises an emitting unit for emitting sensing light and a receiving unit for receiving the sensing light, wherein the emitting unit is provided with a first film layer which can penetrate the sensing light but cannot penetrate visible light, the emitting unit emits the sensing light through the first film layer and the cover plate to irradiate the part of the external object in the sensing area for sensing, and the receiving unit receives the sensing light returned by the external object through the display device to sense the external object.