CN210864744U - Under-screen sensing device and electronic equipment - Google Patents

Abstract

The application provides a sensing device under screen, it includes liquid crystal display module assembly, receiving module assembly and one or more indicating light source, liquid crystal display module assembly is including the liquid crystal display panel who is used for the display frame and being located backlight unit of liquid crystal display panel below. The backlight module is used for providing backlight light required by display. The receiving module is used for receiving a sensing signal returned by an external object through at least part of the display module so as to sense the external object. The indicating light source is located below the backlight module and used for emitting indicating light, when the backlight module is closed and the receiving module performs sensing, the indicating light emitted by the indicating light source is transmitted to the liquid crystal display panel through the backlight module, and the liquid crystal display panel displays a preset marking image by utilizing the indicating light to mark a sensing area of the receiving module on the liquid crystal display module.

Description

Under-screen sensing device and electronic equipment

technical field

The present application belongs to the field of electronic technology, and in particular, relates to an under-screen sensing device and electronic equipment.

Background technique

With the continuous development of smartphone technology, full screen has become a development trend. In order to meet the increasing screen-to-body ratio, more and more sensor modules originally set on the front of the mobile phone are hidden under the screen or inside the screen. However, some sensor modules, such as fingerprint sensor modules, need to interact with the user to realize the sensing function, but when the fingerprint sensor module is placed under the screen or inside the screen, the user cannot accurately perceive the fingerprint detection area , thus adversely affecting the user's fingerprint identification operation and the system identification efficiency.

Utility model content

The present application provides an under-screen sensing device and an electronic device to solve the above technical problems.

Embodiments of the present application provide an under-screen sensing device, which includes: a liquid crystal display module, including: a liquid crystal display panel, used for displaying a picture; and a backlight module, located below the liquid crystal display panel, used for The liquid crystal display panel provides backlight light required for display; a receiving module is used to receive a sensing signal returned by an external object through at least part of the liquid crystal display module, so as to sense the external object; and One or more indicating light sources, located below the backlight module, the indicating light source is used to emit indicating light, when the backlight module turns off the backlight and the receiving module performs sensing, the indicating light source The indicator light emitted is transmitted to the liquid crystal display panel through the backlight module, and the liquid crystal display panel uses the indicator light to display a preset marking image to indicate the position of the receiving module on the liquid crystal display module. sensing area.

In some embodiments, the external object is a fingerprint, and the receiving module is configured to receive a sensing signal returned by the fingerprint and convert it into an electrical signal to obtain fingerprint information.

In some embodiments, the sensed signal includes an optical signal or/and an ultrasonic signal.

In some embodiments, an area on the liquid crystal display module for displaying images is defined as a display area, an area on the liquid crystal display module that cannot display images is defined as a non-display area, and the sensing area is located in the in the display area.

In some embodiments, an area where the preset marking image is displayed on the outer surface of the liquid crystal display module is defined as an indication area, and the indication area is partially or completely overlapped with the sensing area; or

the sensing area is smaller than the indication area and is located within the indication area; or

The indication area is located at the periphery of the sensing area and surrounds the sensing area.

In some embodiments, the under-screen sensing device further includes a driving circuit, the liquid crystal display panel has a plurality of display pixels, and the driving circuit drives a display on the liquid crystal display panel that is directly opposite to the indication area The pixel displays the preset logo image.

In some embodiments, the sensing signal is a sensing light beam, and the sensing light beam returned through the external object includes a sensing light beam reflected by the external object and a sensing light beam that enters the external object and then transmits out.

In some embodiments, the backlight module includes a backlight source, a light guide plate and a reflective sheet, the backlight source is located on one side of the light guide plate, and is used for emitting backlight light, and the backlight light enters the light guide plate and mixes The indicator light source is located under the reflection sheet, and the reflection sheet is located under the bottom surface of the light guide plate, and is used for reflecting the backlight light leaked from the light guide plate back into the light guide plate.

In some embodiments, the reflective sheet has a transmittance of more than 0.3% and less than 5% of the indicator light.

In some embodiments, the indicating light source has a preset light-emitting angle range, an area of the reflective sheet within the light-emitting angle range is defined as an incident area, no holes are opened in the incident area, and the indicating light At least a part of it is projected upward to the liquid crystal display panel after passing through the reflective sheet from the incident area.

In some embodiments, the indicating light source has a preset light-emitting angle range, an area of the reflective sheet within the light-emitting angle range is defined as an incident area, and one or more light-transmitting areas are provided in the incident area A part of the indicator light passes through the reflective sheet through the light-transmitting hole and then projects to the liquid crystal display panel, and another part of the indicator light does not pass through the light-transmitting hole but passes through the reflective sheet and then projects to the LCD panel. The liquid crystal display panel.

In certain embodiments, the indicator light is visible light, and the indicator light has a wavelength in the range of 400nm to 780nm.

In some embodiments, the sensing signal is a sensing beam, and the sensing beam is infrared or near-infrared light with a wavelength range of 750 nm to 2000 nm.

In some embodiments, it also includes a transmitting module, the transmitting module is used for sending a sensing signal to the external object.

In some embodiments, the liquid crystal display module includes a protective cover plate, the protective cover plate is located at the outermost side of the liquid crystal display module, the liquid crystal display panel is located under the protective cover plate, the protective cover The board includes an upper surface and a lower surface arranged oppositely, the upper surface of the protection cover is the outer surface of the liquid crystal display module, the emission module is located below the protection cover, and the sensor emitted by the emission module is The sensing beam enters the interior of the protective cover from the lower surface of the protective cover for total reflection and propagation, and the sensing beam propagated to the sensing area through total reflection diffuses at the position where the external object contacts the upper surface of the protective cover. reflection, and then can penetrate through the protective cover plate and be received by the receiving module through at least part of the liquid crystal display module.

In some embodiments, the total power of the backlight light sources is greater than the total power of the one or more indicator light sources, and when the backlight light sources are turned on, the indicator light sources are turned off.

In some embodiments, the reflective sheet has a transmittance of greater than 0.6% and less than 3% of the indicator light.

An embodiment of the present application further provides an electronic device, which includes the under-screen sensing device according to any one of the foregoing embodiments, and the electronic device is configured to perform a corresponding function according to a sensing result of the under-screen sensing device .

The technical solution provided by the present application is to set the indicator light source to emit indicator light, and replace the backlight light source to provide indicator light to the display panel when the backlight light source is turned off, and the display panel displays a preset indicator image by the indicator light. The location of the sensing area is marked to guide the user to cooperate with the sensing, which saves power consumption and improves the battery life of the electronic device.

Additional aspects and advantages of embodiments of the present invention will be set forth, in part, in the following description, and in part will be apparent from the following description, or learned by practice of embodiments of the invention.

Description of drawings

1 is a schematic diagram of a front structure of an electronic device provided by an embodiment of the present application;

2 is a schematic diagram of an optical path when the under-screen sensing device of the electronic device described in FIG. 1 performs sensing;

3 is a schematic diagram of the optical path when the under-screen sensing device of the electronic device described in FIG. 1 is marking the sensing area;

4 is a schematic diagram of an optical path when an electronic device according to an alternative embodiment of the present application performs sensing area marking;

5 is a schematic diagram of an optical path when an electronic device according to an alternative embodiment of the present application performs sensing and when a sensing area is marked;

6 is a schematic diagram of an optical path when an electronic device according to an alternative embodiment of the present application performs sensing area marking;

7 is a schematic diagram of the front structure of an under-screen sensing device provided by an alternative embodiment of the present application;

8 is a schematic diagram of the front structure of an under-screen sensing device provided by an alternative embodiment of the present application;

9 is a schematic diagram of the front structure of an under-screen sensing device provided by an alternative embodiment of the present application;

FIG. 10 is a schematic diagram of a front structure of an under-screen sensing device provided by an alternative embodiment of the present application.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention. In the description of the present invention, it should be understood that the terms "first" and "second" are only used for description, and should not be interpreted as indicating or implying relative importance or indicating the number or number of technical features indicated. Order. Thus, the technical features defined with "first" and "second" may explicitly or implicitly include one or more of the technical features. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a Detachable connection, or integrated connection; it can be a mechanical connection, an electrical connection or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal communication between two elements or between two elements. interaction relationship. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The following disclosure provides many different embodiments or examples for implementing different structures of the invention. In order to simplify the disclosure of the present invention, only specific example components and settings are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present disclosure may reuse reference numerals and/or reference letters in various instances, such reuse is for simplicity and clarity of presentation of the present disclosure and does not in itself indicate the various embodiments and/or devices discussed. specific relationship between them. In addition, the various specific processes and materials provided in the following description of the present invention are only examples for realizing the technical solutions of the present invention, but those of ordinary skill in the art should realize that the technical solutions of the present invention can also be implemented through the following Other processes and/or other materials described.

Further, the described features and structures may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to enable a thorough understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solutions of the present invention may be practiced without one or more of the specific details, or with other structures, components, and the like. In other instances, well-known structures or operations have not been shown or described in detail to avoid obscuring the essentials of the present invention.

Please refer to FIG. 1 to FIG. 3 , the present invention discloses an electronic device 1 , such as but not limited to suitable types of consumer electronic products, household electronic products, vehicle-mounted electronic products, financial terminal products, etc. of electronic products. Among them, the consumer electronic products are, for example, mobile phones, tablet computers, notebook computers, desktop monitors, all-in-one computers, and the like. Examples of household electronic products are smart door locks, TVs, refrigerators, and the like. The in-vehicle electronic products are, for example, an in-vehicle navigator, an in-vehicle DVD, and the like. The financial terminal products are, for example, ATM machines, terminals for self-service business, and the like.

The electronic device 1 includes an under-screen sensing device 10 . The under-screen sensing device 10 is used to sense external objects located outside the electronic device 1, such as fingerprints on a finger. The electronic device 11 is used to perform corresponding functions according to the sensing results of the under-screen sensing device 10. The corresponding functions include, but are not limited to, unlocking, paying, launching an application after recognizing the external object, or obtaining physical parameters such as the user's heart rate and blood oxygen content to determine any one of the user's mood and health. various combinations.

The under-screen sensing device 10 includes a display module 11 , an emission module 12 , a reception module 13 and one or more indicating light sources 14 . The display module 11 is used for displaying pictures. The transmitting module 12 is used for sending sensing signals to external objects. The display module 11 includes an outermost surface 110 located at the outermost side. The sensing signal returned by the external object enters the under-screen sensing device 10 through the outer surface 110 , and is received by the receiving module 13 for corresponding sensing. The sensing signal returned via the external object may be the sensing signal reflected back by the external object (see the dot-dash line path sent from the emission module 12 in FIG. 2 ), or the sensing signal after entering the external object and then transmitting The outgoing sensing signal (see the solid line path sent from the transmitting module 12 in FIG. 2 ) is not specifically limited in this application. The sensing signal may be, but is not limited to, an optical signal or/and an ultrasonic signal.

In this application, the display module 11 is preferably a liquid crystal display module (Liquid Crystal Display, LCD). Of course, alternatively, the display module 11 can also be a module having other suitable passive light-emitting display panels, such as an electronic paper display module and the like.

In the application, the display module 11 is taken as an example of a liquid crystal display module for description. The liquid crystal display module 11 includes a liquid crystal display panel 111 and a backlight module 112 located below the liquid crystal display panel 111 . The liquid crystal display panel 111 is used for displaying pictures. The backlight module 112 is used to provide backlight light for the liquid crystal display panel 111 .

The liquid crystal display panel 111 has a plurality of display pixels (not shown). Optionally, the under-screen sensing device 10 further includes a driving circuit (not shown). The driving circuit realizes corresponding picture display by modulating the backlight light passing through the display pixels. The display pixel includes, for example, a pixel electrode, a common electrode for forming an electric field with the pixel electrode, and a switch. The driving circuit is connected to the pixel electrode through a switch. The driving circuit can adjust the gray scale displayed by the display pixel by adjusting the magnitude of the clamping pressure applied between the pixel electrode and the common electrode.

The backlight module 112 includes a light enhancement sheet 116 , a diffusion sheet 117 , a backlight light source 113 , a light guide plate 114 and a reflection sheet 115 . The light guide plate 114 includes a light exit surface 1142 , a bottom surface 1140 disposed opposite to the light exit surface 1142 , and a light incident surface 118 connecting the light exit surface 1142 and the bottom surface 1140 . The backlight light source 113 is used for emitting backlight light. The backlight light is visible light. The backlight light enters the light guide plate 114 from the light incident surface 118 and is mixed, and then exits from the light exit surface 1142 to the liquid crystal display panel 111 . The reflective sheet 115 is located below the bottom surface 1140 of the light guide plate 114, and is used for reflecting the backlight light leaking from the bottom surface 1140 of the light guide plate 114 back into the light guide plate 114, so as to improve the utilization rate of the backlight light. The diffusing sheet 117 is located on the side of the light emitting surface 1142 of the light guide plate 114, and is used for diffusing the backlight light emitted from the light emitting surface 1142 of the light guide plate 114, so as to improve the brightness uniformity of the backlight light. The light enhancement sheet 116 is located on the side of the diffusion sheet 117 facing away from the light guide plate 114 , and is used for concentrating the backlight light diffused by the diffusion sheet 117 along the light exit direction, so as to improve the overall brightness of the backlight. It can be understood that when the display module 11 is in a screen-off state, the backlight light source 113 is turned off.

Alternatively, in some embodiments, the enhancement sheet 116 may be omitted.

It can be understood that the liquid crystal display module 11 may further include a protective cover plate 119 . The protective cover plate 119 is located at the outermost side of the liquid crystal display module 11 for protecting the liquid crystal display module 11 . The protective cover 119 includes an upper surface 1190 and a lower surface 1192 which are disposed opposite to each other. The liquid crystal display panel 111 is located on the side of the lower surface 1192 of the protective cover 119 . The outer surface 110 of the liquid crystal display module 11 is the upper surface 1190 of the protective cover plate 119 .

The emission module 12 may be located below at least part of the display module 11 or inside the display module 11 , and the specific position thereof is not limited herein. In this embodiment, the sensing signal is a sensing beam. The emission module 12 is located below the backlight module 112 to emit a sensing beam to an external object through at least a part of the display module 11 . The sensing beam may be infrared or near-infrared light with a wavelength range of 750nm to 2000nm. The emission module 12 may include, but is not limited to, one or more light emitting diodes (Light Emitting Diode, LED), vertical cavity surface emitting laser (Vertical Cavity Surface Emitting Laser, VCSEL), and laser diode (Laser Diode, LD).

The maximum spatial range in which the receiving module 13 can receive the sensing signal returned by the external object is defined as the signal receiving range of the receiving module 13 . For example: the sensing signal is a sensing light beam, and the receiving module 13 includes, for example, a lens module for imaging, then the field of view (Field of View, FOV) of the lens module is the The signal receiving range of the receiving module 13 . The portion of the outer surface 110 located within the signal receiving range of the receiving module 13 is defined as the sensing area S1 , and the receiving module 13 can receive the sensing signal returned by some external objects located in the sensing area S1 . For example, but not limited to, the sensing area S1 is located at a position opposite to the receiving module 13 , and the sensing signal returned by an external object is directly received by the receiving module 13 after passing through at least part of the display module 11 . It can be understood that the returned sensing signal may not be directly received by the receiving module 13 after passing through at least part of the display module 11, but is transmitted through a signal conducting element, such as a light guide structure, etc. The receiving module 13 can receive the receiving module 13 again. For this reason, the receiving module 13 can also be arranged at other positions not opposite to the sensing area 130 . In this embodiment, the external object is a fingerprint, and the sensing signal is a sensing beam. The finger is in contact with the sensing area S1 of the outer surface 110 , so that the sensing beam returned through the fingerprint of the finger can be received by the receiving module 13 . The receiving module 13 senses the fingerprint information of the finger according to the received sensing beam.

The area on the display module 11 for displaying images is defined as the display area 104 . The area on the display module 11 where the picture cannot be displayed is defined as the non-display area 106. The non-display area 106 may be located at the periphery or edge of the display area 104 . The display area 104 may completely overlap with the pixel area (not shown) in the display module 11 for displaying images. The part of the protective cover 119 facing the non-display area 106 is provided with a non-transparent film material, which is used to block visible light so that the user cannot see the under-screen sensing from the non-display area 106 outside. Internal components of device 10 . It can be understood that the display area 140 may also be smaller than the pixel area used for displaying images in the display module 11 , that is, a part of the pixel area may be located in the non-display area 106 and blocked by the non-transparent film material. .

It should be noted that the position of the emission module 12 is not limited to the bottom of the backlight module 112 , and can also be located at any other suitable position, for example, beside the liquid crystal display panel 111 or the backlight module 112 Side wait. In addition, when the sensing signal emitted by the emitting module 12 is mainly emitted from above the protective cover plate 119 through the non-transparent film material, the non-transparent film material is at least on the surface of the emitting module 12 . The illuminated area can transmit the sensing signal. Wherein, the sensing signal is an invisible light signal, such as infrared or near-infrared light.

Alternatively, in some embodiments, the emission module 12 may also be omitted.

Optionally, the sensing area S1 is located in the display area 104 . The receiving module 13 is disposed below the display module 11 and located in the display area 104 . The sensing area S1 is disposed opposite to the receiving module 13 . The projection of the receiving module 13 on the outer surface 110 is located in the sensing area S1.

It can be understood that, in other alternative embodiments, the receiving module 13 may also be disposed inside the display module 11 . For example, the receiving module 13 may be a photosensitive element disposed in the display pixel, and the sensing beam returned by the external object passes through at least part of the display module 11 and is received by the photosensitive element to realize corresponding sensing . The receiving module 13 may also be set at other suitable positions, which are not specifically limited in this application.

The indicating light source 14 is disposed under the backlight module 112 for emitting indicating light, and the indicating light transmits a part of the outer surface 110 that can be irradiated by the display module 11 and is defined as an indicating region D1. The indication area D1 can be used to display a preset marking image on the outer surface to mark the position where the sensing area S1 is located, so as to guide the user to cooperate with the sensing. For example, if the under-screen sensing device 10 is an under-screen fingerprint identification device, the indication area D1 can be used to guide the user to place a finger on the sensing area S1 for fingerprint identification. In this embodiment, the indication area D1 is located in the display area 104 and is a partial area of the display area 104 . Optionally, the indication area D1 completely coincides with the sensing area S1, or the indication area D1 is located in the sensing area S1, or the sensing area S1 is located in the indication area D1 but two Either the area is not much different, or the indication area D1 surrounds the sensing area S1 , or a portion of the indication area D1 overlaps with a portion of the sensing area S1 , and so on.

It can be understood that the indicating light source 14 is a visible light source, and the emitted indicating light is visible light. The indicating light source 14 is, for example, the Light Emitting Diode (LED), a Vertical Cavity Surface Emitting Diode (VCSEL), and a Laser Diode (LD).

One or more of the indicating light sources 14 can be arranged according to a preset rule or irregularly. For example, a plurality of the indicating light sources 14 are symmetrically distributed with the receiving module 13 as the center, and the plurality of the indicating light sources 14 and the receiving The indicating light sources 14 may be arranged at equal intervals or at unequal intervals.

Specifically, one or more of the indicating light sources 14 are located under the reflection sheet 115 . The indicator light emitted by one or more indicator light sources 14 passes through the reflective sheet 115 , and then exits below the liquid crystal display panel 111 through film structures such as the light guide plate 114 , the diffuser sheet 117 , and the light enhancement sheet 116 . Wherein, the transmittance of the reflection sheet 115 to the indicator light is, for example, less than 10% and greater than 0. Optionally, the transmittance of the reflective sheet 115 to the indicator light is less than 5% and greater than 0.3%. Therefore, the display effect when the liquid crystal display panel 111 displays a full-screen image and the display effect when the preset logo image is displayed are both better. Of course, alternatively, in some embodiments, the transmittance of the reflective sheet 115 to the indicator light can also be less than 3% and greater than 0.6%.

When the sensing signal is infrared or near-infrared light, the reflection sheet 115 can also transmit the infrared or near-infrared light, and the transmittance of the infrared or near-infrared light is greater than 70%, for example.

The reflection sheet 115 is, for example, but not limited to, an enhanced specular reflection sheet (ESR), which is formed by laminating or laminating multiple layers of polymers with different refractive indices for visible light beam and near-infrared light. Of course, alternatively, in some embodiments, the reflective sheet 115 can also be other suitable structures.

The diffusing sheet 117 performs homogenization processing on the passing indicator light, which can make the diffusion angle of the indicator light emitted from the indicator light source 14 larger and the indicator light as a whole more uniform. Correspondingly, when the plurality of indicating light sources 14 are arranged around the receiving module 13, the visible light beams emitted by the plurality of indicating light sources 14 can be, for example, above the receiving module 13 or on the liquid crystal display panel after the homogenization process by the diffusing sheet 117. A whole bunch of beams is formed under the local area of 111.

Correspondingly, when the backlight light source 113 is turned off and the receiving module 13 performs fingerprint sensing, the indicating light source 14 provides a visible light beam for the image display of the liquid crystal display panel 111 , and the driving circuit drives the liquid crystal display panel 111 . Some of the display pixels display a preset sign image in the indication area D1. It should be noted that the area where the liquid crystal display panel 111 displays the preset sign image is the indication area D1. The preset marking image is, for example, but not limited to, a fingerprint pattern.

As can be seen from the above, if the display pixels located in the indication light irradiation range are turned on, the indication light can pass through the display pixels and irradiate on the outer surface 110 of the liquid crystal display module 11 to form the indication area D1. The liquid crystal display panel 111 can display a preset sign image in the indication area D1 by means of the indication light. The marked image is used to prompt the user where the sensing area S1 is located, so that the user can touch the sensing area S1 with a finger during detection. In addition to the above-mentioned fingerprint pattern, the marking image can also be other light-emitting areas with different shapes, for example. The driving circuit can change the shape, brightness and color of the marking image by adjusting the light transmission state of the display pixels of the liquid crystal display panel 111 .

It can be understood that, in order to form the indicating area D1 at the position of the sensing area S1 opposite to the receiving module 13 , the light emitting direction of the indicating light source 14 may be inclined toward the receiving module 13 .

Optionally, when the backlight light source 113 is turned on, the indicating light source 14 is turned off.

The total power of the one or more indicating light sources 14 is less than the total power of the backlight light sources 113 . Thereby, the standby capability of the electronic device 1 can be improved.

Optionally, the indicating light source 14 has, for example, a preset light-emitting angle range. The light-emitting angle range is defined as the spatial range that the indicator light emitted by the indicator light source 14 can irradiate. The area of the reflection sheet 115 located within the light-emitting angle range of the indicator light source 14 is defined as the incident area I1. The incident area I1 on the reflective sheet 115 has no holes, and at least a part of the indicator light is projected upward from the incident area through the reflective sheet 115 to the liquid crystal display panel 111 to display the preset indication image.

As shown in FIG. 4 , in other alternative embodiments, one or more light-transmitting holes 1150 may be opened on the reflective sheet 115 at a position opposite to the emitting module 12 , and a part of the indicating light can pass through The light-transmitting holes 1150 pass through the reflection sheet 115 and then project to the liquid crystal display panel 111 , and a part of the indicator light can pass through the reflection sheet 115 without passing through the light-transmitting holes 1150 and then be projected to the liquid crystal display panel 111. The light-transmitting hole 1150 is opened in the incident area I1. By opening the light-transmitting holes 1150 on the reflection sheet 115, the overall luminous flux of the indicator light projected on the liquid crystal display panel 111 through the reflection sheet 115 can be increased, which is beneficial to improve the brightness of the displayed indicator image, or to maintain On the premise of the same brightness of the marked image, the power consumption of the pointing light source 14 is reduced. The light-transmitting hole 1150 is located in the incident area I1. A plurality of the indicating light sources 14 may form a corresponding plurality of incident areas D1 on the reflection sheet 115 , and one or more light-transmitting holes 1150 may be formed in each of the incident areas D1 . Since the size of the light-transmitting hole 1150 is small, for example, 10 microns, the display effect of the liquid crystal display module 11 will not be affected.

As shown in FIG. 5 , in other alternative embodiments, the emission module 12 may also be located below a portion of the protective cover plate 119 in the non-display area 106 . The sensing beam emitted by the emitting module 12 enters the interior of the protective cover 19 from the lower surface 1192 of the protective cover 119 for total reflection and propagation, and the sensing beam propagates to the sensing area S1 through total reflection in the fingerprint. The position where the ridges contact the upper surface 1190 of the protective cover plate 1190 is diffusely reflected, which can penetrate through the protective cover plate 119 and be received by the receiving module 14 through at least part of the display module 11 . The diffusely reflected sensing beams are irradiated in all directions. The sensing light beams emitted by the transmitting module 12 and the sensing light beams entering the inside of the protective cover 119 are non-collimated light beams or non-parallel light beams. The sensing beam of the non-collimated light includes a plurality of sensing rays, and the included angles of at least two sensing rays are not less than 10 degrees, 15 degrees, 20 degrees, and 25 degrees.

As shown in FIG. 6 , it can be understood that a plurality of corresponding indication areas D1 can also be formed on the outer surface 110 after the indication light rays respectively emitted by the plurality of indication light sources 14 are homogenized by the respective film layers in the backlight module 112 . . A plurality of the indication areas D1 may be separated from each other or partially overlapped, and the liquid crystal display panel 111 may display the marking images in the plurality of indication areas D1 respectively, which is not limited in this application. .

Optionally, a plurality of the indication areas D1 may partially overlap with the sensing area S1 or cover the entire sensing area S1. For example, as shown in FIG. 7 , a plurality of the indication areas D1 are arranged around the sensing area S1 and partially overlap with the sensing area S1 respectively, and the plurality of indication areas D1 do not overlap each other . Alternatively, as shown in FIG. 8 , a plurality of the indication areas D1 may be located inside the sensing area S1. Alternatively, as shown in FIG. 9 , a plurality of the indication areas D1 overlap with the sensing area S1 respectively, and the plurality of indication areas D1 also overlap each other, so as to form a large enough area to cover the entire The indication area D1 of the sensing area S1. Alternatively, as shown in FIG. 10 , a plurality of the indication areas D1 are located at the periphery of the sensing area S1 and surround the sensing area S1. The pattern formed by connecting the midpoints of the plurality of indication regions D1 may be a circle, a triangle, a square, a rhombus, a hexagon, or the like. The indication area D1 may also be center-symmetrically distributed with the sensing area S1 as the center.

In this embodiment, the receiving module 13 and the indicating light source 14 are both disposed below the liquid crystal display module 11 and located in the display area 104 . The indicating light source 14 is located on the periphery of the receiving module 13 and is arranged around the receiving module 13 . Optionally, the indicating light sources 14 are centered on the receiving module 13 and are distributed symmetrically around the center. When the liquid crystal display module 11 is in a screen-off state, or when the liquid crystal display module 11 is in a screen-off state and needs to perform corresponding sensing, the backlight light source 113 is turned off, and the indicating light source 14 emits indicating light In order to form the indication area D1 on the outer surface 110 of the liquid crystal display module 11 . The driving circuit drives the display pixels on the liquid crystal display panel 111 that are directly opposite the indication area D1 to display a preset marking image, so as to mark the position of the sensing area S1. The number of the indicating light sources 14 is less than the number of the backlight light sources 113 . Therefore, the power consumption of the indicating light source 14 is less than the power consumption of the backlight light source 113 . Therefore, the sensing area S1 is marked by the indicating light source 14 with lower power consumption in the screen-off state, so that the backlight light source 113 with higher power consumption does not need to be activated, which has the beneficial effect of energy saving.

It can be understood that the indicating light source 14 , the receiving module 13 , or/and the transmitting module 12 can be attached to the bottom of the display module 11 . Alternatively, the indicating light source 14, the receiving module 13, and/or the transmitting module 12 can also be fixed on the display module 11 through other structures of the electronic device 1, such as the middle frame or glue iron of the mobile phone. below. The present application does not specifically limit the fixing methods of the indicating light source 14 , the receiving module 13 , or/and the transmitting module 12 .

To sum up, in the embodiment of the present application, by setting the indicator light source 14 to emit indicator light, it can replace the backlight light of the backlight light source 113, and the indicator light is used to mark the position of the sensing area S1 to guide the The user cooperates with the sensing, which saves power consumption and improves the battery life of the electronic device 1 .

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples", etc. A particular feature, structure, material, or characteristic described in this embodiment or example is included in at least one embodiment or example of the present invention. 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 are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the utility model.

Claims (15)

1. An underscreen sensing device, comprising:

a liquid crystal display module comprising:

the liquid crystal display panel is used for displaying pictures; and

the backlight module is positioned below the liquid crystal display panel and used for providing backlight light required by display for the liquid crystal display panel;

the receiving module is used for receiving a sensing signal returned by an external object through at least part of the liquid crystal display module so as to sense the external object; and

the backlight module is used for receiving the backlight light emitted by the light source, the receiving module is used for receiving the backlight light emitted by the light source, one or more indicating light sources are positioned below the backlight module, the indicating light sources are used for emitting indicating light, when the backlight module closes the backlight light and the receiving module executes sensing, the indicating light emitted by the indicating light sources is transmitted to the liquid crystal display panel through the backlight module, and the liquid crystal display panel displays a preset marking image by utilizing the indicating light so as to mark a sensing area of the receiving module on the liquid crystal display module.

2. The off-screen sensing device of claim 1, wherein the external object is a finger fingerprint, and the receiving module is configured to receive a sensing signal returned by the finger fingerprint and convert the sensing signal into an electrical signal to obtain fingerprint information.

3. The underscreen sensing device of claim 1, wherein the sensing signal is a sensing beam, the sensing beam is infrared or near infrared light, and the wavelength range is 750nm to 2000 nm.

4. The device as claimed in claim 1, wherein the area of the liquid crystal display module for displaying the image is defined as a display area, the area of the liquid crystal display module which cannot display the image is defined as a non-display area, and the sensing area is located in the display area.

5. The off-screen sensing device of claim 1, wherein an area on an outer surface of the liquid crystal display module where the preset indication image is displayed is defined as an indication area, and the indication area is partially or completely overlapped with the sensing area; or

The sensing area is smaller than the indicating area and is located within the indicating area; or

The indication region is located at a periphery of the sensing region and surrounds the sensing region.

6. The under-screen sensing device as claimed in claim 5, further comprising a driving circuit, wherein the LCD panel has a plurality of display pixels, and the driving circuit drives the display pixels of the LCD panel opposite to the indication region to display a predetermined indication image.

7. The underscreen sensing apparatus of claim 1, wherein the sensing signal is a sensing beam, and the sensing beam returned via the external object includes a sensing beam reflected by the external object and a sensing beam transmitted after entering the external object.

8. The device as claimed in claim 1, wherein the backlight module comprises a backlight source, a light guide plate and a reflector plate, the backlight source is disposed at one side of the light guide plate and used for emitting backlight light, the backlight light enters the light guide plate and is mixed and then emitted to the liquid crystal display panel, the indicator light source is disposed below the reflector plate, and the reflector plate is disposed below the bottom surface of the light guide plate and used for reflecting the backlight light leaked from the light guide plate back into the light guide plate.

9. The underscreen sensing device of claim 8, wherein the reflective sheet has a transmittance of greater than 0.3% and less than 5% for the indicator light.

10. The device as claimed in claim 8, wherein the indication light source has a predetermined light-emitting angle range, the area of the reflector within the light-emitting angle range is defined as an incident area, no hole is formed in the incident area, and at least a portion of the indication light is projected from the incident area to the lcd panel after passing through the reflector; or one or more light holes are formed in the incident area, part of the indicating light passes through the reflector plate through the light holes and then is projected to the liquid crystal display panel, and the other part of the indicating light passes through the reflector plate without passing through the light holes and then is projected to the liquid crystal display panel.

11. The underscreen sensing device of claim 1, further comprising an emission module configured to emit a sensing signal to the external object.

12. The underscreen sensing device of claim 11, wherein the liquid crystal display module includes a protective cover plate, the protective cover plate is positioned at the outermost side of the liquid crystal display module, the liquid crystal display panel is positioned below the protective cover plate, the protective cover plate comprises an upper surface and a lower surface which are oppositely arranged, the upper surface of the protective cover plate is the outer surface of the liquid crystal display module, the transmitting module is positioned below the protective cover plate, the sensing light beams transmitted by the transmitting module enter the protective cover plate from the lower surface of the protective cover plate for total reflection propagation, the sensing light beams propagated to the sensing area through total reflection are subjected to diffuse reflection at the position where an external object is contacted with the upper surface of the protective cover plate, and the protective cover plate can be penetrated out and at least part of the liquid crystal display module is received by the receiving module.

13. The underscreen sensing device as claimed in claim 8 wherein a total power of said backlight light source is greater than a total power of said one or more indicator light sources, and wherein said indicator light sources are off when said backlight light source is on.

14. The underscreen sensing device of claim 9, wherein the reflective sheet has a transmittance of greater than 0.6% and less than 3% for the indicator light.

15. An electronic device, comprising the under-screen sensing device as claimed in any one of claims 1 to 14, wherein the electronic device is configured to perform a corresponding function according to a sensing result of the under-screen sensing device.

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