CN114779491B

CN114779491B - Terminal display module and mobile terminal

Info

Publication number: CN114779491B
Application number: CN202210694294.7A
Authority: CN
Inventors: 陈驰; 李安; 张莉萍
Original assignee: Ansijiang Technology Nanjing Co ltd
Current assignee: Ansijiang Technology Nanjing Co ltd
Priority date: 2022-06-20
Filing date: 2022-06-20
Publication date: 2022-09-16
Anticipated expiration: 2042-06-20
Also published as: CN114779491A

Abstract

The invention discloses a terminal display module and a mobile terminal, wherein the terminal display module comprises a display panel and a three-dimensional imaging module; the vertical projection of the three-dimensional imaging module on the plane of the display panel is positioned in the auxiliary display area of the display panel; the three-dimensional imaging module comprises an emitting module and a receiving module, the emitting module comprises a structured light source and a floodlight source, the structured light source and the floodlight source both use HCG-VCSEL as light sources to emit linearly polarized light with the same polarization direction, and the receiving module is used for receiving light beams transmitted by the linear polarization layer and imaging; the terminal display module further comprises a linear polarization layer positioned on the light incoming path of the receiving module, and the light transmission axis direction of the linear polarization layer is consistent with the polarization direction of linearly polarized light emitted by the HCG-VCSEL. The invention solves the problem that the three-dimensional structured light imaging displayed by the existing terminal is easily influenced by the external environment light and the transmittance of the display panel to cause poor imaging quality, and is beneficial to improving the three-dimensional structured light imaging quality.

Description

Terminal display module and mobile terminal

Technical Field

The invention relates to the technical field of mobile terminals, in particular to a terminal display module and a mobile terminal.

Background

At present, mobile terminals have entered the full screen era, and display screens in various forms such as bang screens, water drop screens, hole digging screens and the like are produced in order to hide related devices such as structured light modules and the like. However, these solutions affect the aesthetics and result in a low occupancy of the screen, not the final perfect full screen morphology, whereas the under-screen structured light technology is the best solution to achieve a true full screen morphology.

The three-dimensional imaging module in the current under-screen structured light technology generally can comprise three parts: the infrared floodlight module, the infrared receiving module, and the structured light projecting module are usually implemented by using a Vertical Cavity Surface Emitting Laser (VCSEL) or a Light Emitting Diode (LED) device as a light source. The infrared floodlight source module emits uniform infrared light to irradiate on a target object, the target object reflects the infrared light to form an infrared image on the infrared receiving module finally, and the infrared image can be used for face detection, framing of a human face, face feature comparison, face recognition and the like in different scenes. The structured light emitted by the structured light projection module irradiates on a target object, the structured light reflected by the target object forms an infrared speckle characteristic image on the infrared receiving module, the depth image of the object is obtained by calculation according to the infrared speckle characteristic image formed on the infrared receiving module through a final algorithm, the depth information of the target object is increased through the depth image, and a plane attack means can be effectively responded.

However, since there is light with the same wavelength as the infrared floodlight source module and the structured light projector in the environment, infrared light in the environment light can be imaged on the infrared receiving module after being reflected by the target object, and finally the imaging quality of the infrared image and the depth map calculation accuracy are affected.

In addition, the current screen is very low to the transmissivity of light, if directly place the screen with three-dimensional imaging module under, under the circumstances of guaranteeing range finding and measurement accuracy, need to increase the luminous power that module was thrown to infrared floodlight source module and structured light among the three-dimensional imaging module, the consumption of 3D structured light module that can greatly increased like this, consequently, how to solve the low influence to the structured light imaging quality of screen transmissivity and how to reduce the influence of ambient light to infrared picture imaging quality, be the problem that the light system needs to solve urgent need of present screen lower structure.

Disclosure of Invention

The invention provides a terminal display module and a mobile terminal, which aim to solve the problem of poor imaging quality caused by the fact that three-dimensional structured light imaging displayed by the conventional terminal is easily influenced by external environment light and the transmittance of a display panel.

In a first aspect, the invention provides a terminal display module, which comprises a display panel and a three-dimensional imaging module, wherein the three-dimensional imaging module is positioned on one side of the display panel, which deviates from light emitting;

the display panel comprises a main display area and an auxiliary display area which are mutually connected, the transmittance of the auxiliary display area is greater than that of the main display area, and the vertical projection of the three-dimensional imaging module on the plane where the display panel is located in the auxiliary display area;

the three-dimensional imaging module comprises a transmitting module and a receiving module, and the transmitting module and the receiving module are distributed at intervals on a plane parallel to the display panel;

the transmitting module comprises a structured light source and a floodlight source, the structured light source and the floodlight source both comprise high-contrast grating vertical cavity surface emitting lasers, and the high-contrast grating vertical cavity surface emitting lasers in the structured light source and the floodlight source emit linearly polarized light with the same polarization direction;

the terminal display module further comprises a linear polarization layer, the linear polarization layer is located on a light inlet path of the receiving module, and the light transmission axis direction of the linear polarization layer is consistent with the polarization direction of linearly polarized light emitted by the high-contrast grating vertical cavity surface emitting laser;

the transmitting module is used for transmitting the structural light beams and the floodlight beams at intervals, and the receiving module is used for receiving the structural light reflected beams and the floodlight reflected beams transmitted by the linear polarization layer at intervals and respectively forming speckle characteristic images and uniform images.

In a second aspect, the present invention further provides a mobile terminal, including any one of the terminal display modules provided in the present invention.

According to the technical scheme, the terminal display module is provided with the display panel and the three-dimensional imaging module, and the three-dimensional imaging module is located on one side of the display panel, which is far away from the light emitting side; the display panel comprises a main display area and an auxiliary display area which are mutually connected, the transmittance of the auxiliary display area is greater than that of the main display area, and the vertical projection of the three-dimensional imaging module on the plane where the display panel is located in the auxiliary display area; the three-dimensional imaging module comprises a transmitting module and a receiving module which are distributed at intervals on a plane parallel to the display panel; the transmitting module comprises a structured light source and a floodlight source, the structured light source and the floodlight source both comprise high-contrast grating vertical cavity surface emitting lasers, and linearly polarized light with the same emergent polarization direction is emitted by the high-contrast grating vertical cavity surface emitting lasers in the structured light source and the floodlight source; the terminal display module also comprises a linear polarization layer, the linear polarization layer is positioned on the light incident path of the receiving module, and the direction of the light transmission axis of the linear polarization layer is consistent with the polarization direction of the linearly polarized light emitted by the high-contrast grating vertical cavity surface emitting laser; the transmitting module is used for transmitting the structural light beams and the floodlight beams at intervals, and the receiving module is used for receiving the structural light reflected beams and the floodlight reflected beams transmitted by the linear polarization layer at intervals and respectively forming speckle characteristic images and uniform images. The invention solves the problem of poor imaging quality caused by the fact that the three-dimensional structure light imaging displayed by the existing terminal is easily influenced by external environment light and the transmittance of a display panel, and can realize partial absorption of the external environment light by using a high-contrast grating vertical cavity surface emitting laser as a light source and matching with a line polarization film, thereby improving the ambient light interference resistance of the three-dimensional imaging module under the screen and reducing the amplitude of ambient light interference by 50 percent. Meanwhile, the attenuation of effective signal light can be avoided, the signal-to-noise ratio of the effective signal light is improved, the power consumption of the whole system is reduced, and the light energy utilization rate of the system is improved.

Drawings

Fig. 1 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a terminal display module according to an embodiment of the present invention;

FIG. 3 is a schematic view of the polarization state of light in the terminal display module shown in FIG. 2;

fig. 4 is a schematic structural diagram of another transmitting module of the terminal display module according to the embodiment of the present invention;

fig. 5 is a schematic structural diagram of another transmitting module of the terminal display module according to the embodiment of the present invention;

fig. 6 is a schematic structural diagram of another receiving module of the terminal display module according to the embodiment of the present invention;

fig. 7 is a schematic structural diagram of another terminal display module according to an embodiment of the present invention;

FIG. 8 is a partially enlarged view of the terminal display module shown in FIG. 7;

FIG. 9 is a schematic view of the polarization state of light in the terminal display module shown in FIG. 7;

FIG. 10 is another enlarged view of a portion of the terminal display module shown in FIG. 7;

FIG. 11 is a schematic view of the polarization state of light in the terminal display module shown in FIG. 10;

fig. 12 is a schematic structural diagram of another terminal display module according to an embodiment of the present invention;

FIG. 13 is an enlarged view of a portion of the terminal display module of FIG. 12;

FIG. 14 is a schematic view of the polarization state of light in the terminal display module shown in FIG. 12;

FIG. 15 is another enlarged view of a portion of the terminal display module of FIG. 12;

FIG. 16 is a schematic diagram illustrating the polarization state of light in the terminal display module shown in FIG. 15.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The term "include" and variations thereof as used herein are intended to be open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment".

It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used for distinguishing corresponding contents, and are not used for limiting the order or interdependence relationship.

It is noted that references to "a", "an", and "the" modifications in the present invention are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that reference to "one or more" unless the context clearly dictates otherwise.

Fig. 1 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a terminal display module according to an embodiment of the present invention, and referring to fig. 1, the mobile terminal according to an embodiment of the present invention includes any one of the terminal display modules 1 according to an embodiment of the present invention. Referring to fig. 2, the terminal display module 1 according to the embodiment of the present invention may include a display panel 30 and a three-dimensional imaging module 100, where the three-dimensional imaging module 100 is located on a side of the display panel 30 facing away from the light exit; the display panel 30 comprises a main display area 31 and an auxiliary display area 32 which are mutually adjacent, the transmittance of the auxiliary display area 32 is greater than that of the main display area 31, and the vertical projection of the three-dimensional imaging module 100 on the plane where the display panel 30 is located in the auxiliary display area 32.

The three-dimensional imaging module 100 comprises a transmitting module 10 and a receiving module 20, wherein the transmitting module 10 and the receiving module 20 are mutually distributed at intervals on a plane parallel to the display panel 30; the emission module 10 includes a structured light source 11 and a floodlight source 13, both the structured light source 11 and the floodlight source 13 include a high contrast grating Vertical Cavity Surface Emitting Laser (HCG-VCSEL) 101, and the high contrast grating Vertical Cavity Surface Emitting lasers 101 in the structured light source 11 and the floodlight source 13 emit linearly polarized light in the same polarization direction; the terminal display module 1 further includes a linear polarization layer 320, the linear polarization layer 320 is located on the light incident path of the receiving module 20, and the light transmission axis direction of the linear polarization layer 320 is consistent with the polarization direction of the linearly polarized light emitted from the high-contrast grating vertical cavity surface emitting laser 101.

The transmitting module 10 is used for transmitting the structural light beams and the floodlight beams at intervals, and the receiving module 20 is used for receiving the structural light reflected beams and the floodlight reflected beams transmitted by the linear polarization layer 320 at intervals and respectively forming speckle characteristic images and uniform infrared images.

First, the terminal display module 1 is provided with a main display area 31 and an auxiliary display area 32 in a display panel 30, and the difference is mainly in transmittance. The main display area 31 is responsible for emitting light to the outside, namely displaying pictures, and has low transmittance; the auxiliary display area 32 is responsible for ensuring that the internal light is transmitted to the outside and the external light is transmitted to the inside of the terminal display module 1, the external light comprises the light which is actively emitted by the mobile display module 1 and is reflected back through the outside, the external light also comprises ambient light, and the transmittance of the auxiliary display area 32 is higher than that of the main display area 31. It should be noted that the auxiliary display area 32 may be a transparent area formed by changing the panel structure on the display panel 30 to adjust the transmittance, and the auxiliary display area is provided with a light emitting unit as the main display area 31, and is responsible for displaying a picture, so as to implement full-screen display in a matching manner.

The three-dimensional imaging module 100 is provided in the embodiment of the present invention, and is used for implementing the biological identification function of the terminal display module 1. Specifically, the three-dimensional imaging module 100 includes a transmitting module 10 and a receiving module 20, where the transmitting module 10 is responsible for emitting light to the outside, and the receiving module 20 is responsible for receiving light reflected back from the outside. In order to avoid the mutual interference between the transmitting module 10 and the receiving module 20, the transmitting module 10 and the receiving module 20 may be spaced apart from each other on a plane parallel to the display panel 30. The three-dimensional imaging module 100 is arranged on one side of the display panel 30 deviating from the light, and the vertical projection of the plane where the display panel 30 is located in the auxiliary display area 32, so that the three-dimensional imaging module 100 is arranged under the screen of the display panel 30 to assist the display area 32, the completeness and the attractiveness of the display panel 30 are guaranteed, and meanwhile, the transmitting module 10 and the receiving module 20 can normally transmit and receive external light to the outside. In other words, the auxiliary display area 32 is required to cover the light-emitting viewing angle range of the transmitter module 10 and the light-receiving viewing angle range of the receiver module 20. The following describes the 3D structured light imaging principle of the three-dimensional imaging module 100. Firstly, the structured light source 11 and the floodlight source 13 in the transmitting module 10 can transmit structured light beams and floodlight beams at intervals by controlling, the floodlight beams are emitted from the auxiliary display area 32 and then reflected by objects such as human faces, and then are incident into the receiving module 20 through the auxiliary display area 32, and the receiving module 20 can form uniform images according to the floodlight reflected beams. After the structured light beam is emitted and reflected to the receiving module 20 in the same way, the receiving module 20 can form a speckle characteristic pattern according to the structured light beam. As known to those skilled in the art, due to the speckle feature arranged in the structured light beam, after being reflected by the object, the three-dimensional information of the object can be determined according to the reflected speckle feature. And finally, the depth image of the target scene can be obtained by processing the uniform image and the speckle characteristic image, the depth information of the target scene is increased by the depth image, and a plane attack means can be effectively responded. It should be noted that the structured light beam and the flood light beam emitted by the emission module 10 are mainly infrared beams, and of course, those skilled in the art can adjust the wave band of the light beam according to actual needs, and the present disclosure is not limited thereto.

More specifically, for the imaging process of the 3D structured light, as known to those skilled in the art, the light emitted from the structured light source 11 is generally divided into three types: discrete spots, bar light, and coded structured light. When the infrared structured light imaging device works, light spots which are specially coded are projected onto an object through the light source projector, the object reflects infrared light, and the receiving module 20 receives reflected light to form a structured light infrared image with characteristic coding characteristics, namely a speckle characteristic image; matching calculation is carried out on the currently collected structured light infrared image and a pre-collected and stored reference structured light image (matched pixel points are found along the line-by-line scanning direction of the infrared image), and deviation of pixels in the current structured light image relative to corresponding pixels in the reference structured light image is obtained; based on the principle of triangulation, the depth value of the pixel can be calculated by using the deviation amount, so that the depth image of the whole picture is obtained. The deviation amount generally refers to a deviation amount along the infrared image scanning direction, so that the structured light scattering spots are generally required to have very high randomness along the infrared image scanning direction to prevent the mismatching phenomenon. It can also be understood that, although the structured light source 11 and the floodlight source 13 in the embodiment of the present invention are both designed by using the high-contrast grating vertical cavity surface emitting laser 101, and the outgoing linear polarization of the structured light source and the floodlight source are ensured, the internal structures thereof, especially the arrangement manner of the light emitting points in the light source, are significantly different. For the structured light source 11, the arrangement of the light emitting points therein should meet the pseudo-random arrangement requirement, so that a random speckle point characteristic image is formed during imaging, and the depth information is finally obtained through pixel matching and calculation of deviation amount. For the floodlight source 13, the light emission requirement is only uniform scattering light beams, and the arrangement manner of the light emission points is not limited, and the light emission points may be regularly arranged in an array or randomly arranged.

In the embodiment of the invention, the structured light source 11 and the floodlight source 13 are provided with the high-contrast grating vertical cavity surface emitting laser as the light source, so that the structured light beam and the floodlight beam are linearly polarized light, and the linear polarization layer 320 is arranged on the light incident path of the receiving module 20, so as to reduce the interference of ambient light on the biological identification function of the three-dimensional imaging module. Fig. 3 is a schematic diagram of the polarization state of light in the terminal display module shown in fig. 2, and the following explains the specific principle with reference to fig. 3 as follows: the structured light source 11 and the floodlight source 13 both use a high-contrast grating vertical cavity surface emitting laser as a light source, which both emit the same linearly polarized light (as shown by black dots in the figure to be the direction vertical to the paper surface), and the structured light reflected light beam and the floodlight reflected light beam after being reflected by objects such as a human face are still linearly polarized light. Since the direction of the transmission axis of the linear polarization layer 320 (also illustrated as the direction perpendicular to the paper surface in the figure) is the same as the polarization direction of the linearly polarized light emitted from the high-contrast grating vcsel (the direction perpendicular to the paper surface), the part of the reflected light beam can be transmitted through the linear polarization layer 320 and enter the receiving module 20, thereby ensuring the biometric function. And because the emergent light polarization direction of structured light source, floodlight source is unanimous with the light transmission axis direction of linear polarization membrane, this two kinds of effective signal light can see through this linear polarization membrane without the loss after target object reflects back, finally reaches in the receiving module, therefore the linear polarization membrane of display panel auxiliary display district does not produce the decay to effective signal light to can promote effective signal light's SNR, reduce entire system's consumption, promote system light energy utilization ratio.

However, since the external environment light can be understood as natural light, and due to the non-polarization characteristic (the multi-directional arrows in the drawing indicate the polarization direction of natural light), light which is not in accordance with the transmission axis direction of the linear polarization film 320 is absorbed when passing through the linear polarization layer 320, that is, only light which is in accordance with the polarization direction of the linear polarization layer 320 is transmitted. In an ideal imaging state, the receiving module 20 only images the light emitted by the emitting module 10, but the ambient light includes the light with the same wavelength as the light emitted from the emitting source, and the imaging of the ambient light on the receiving module 20 may reduce the signal-to-noise ratio of the final image. However, in the embodiment of the present invention, by disposing the linear polarization film on the light incident path of the receiving module 20, 50% of the ambient light can be absorbed, and the influence of the ambient light on the imaging quality of the receiving module is greatly reduced.

According to the technical scheme of the embodiment of the invention, the terminal display module is internally provided with the display panel and the three-dimensional imaging module, and the three-dimensional imaging module is positioned on one side of the display panel, which deviates from the light; the display panel comprises a main display area and an auxiliary display area which are mutually connected, the transmittance of the auxiliary display area is greater than that of the main display area, and the vertical projection of the three-dimensional imaging module on the plane where the display panel is located in the auxiliary display area; the three-dimensional imaging module comprises a transmitting module and a receiving module which are distributed at intervals on a plane parallel to the display panel; the transmitting module comprises a structured light source and a floodlight source, the structured light source and the floodlight source both comprise high-contrast grating vertical cavity surface emitting lasers, and the high-contrast grating vertical cavity surface emitting lasers in the structured light source and the floodlight source emit linearly polarized light in the same polarization direction; the terminal display module also comprises a linear polarization layer, the linear polarization layer is positioned on the light incoming path of the receiving module, and the direction of a light transmission axis of the linear polarization layer is consistent with the polarization direction of linearly polarized light emitted by the high-contrast grating vertical cavity surface emitting laser; the transmitting module is used for transmitting the structural light beams and the floodlight beams at intervals, and the receiving module is used for receiving the structural light reflected beams and the floodlight reflected beams transmitted by the linear polarization layer at intervals and respectively forming speckle characteristic images and uniform images. The embodiment of the invention solves the problem that the three-dimensional structure light imaging displayed by the existing terminal is easily interfered by external environment light to cause poor imaging quality, utilizes the high-contrast grating vertical cavity surface emitting laser as a light source, can realize partial absorption of the external environment light through the matching of the line polarization film, improves the anti-environment light interference capability of the three-dimensional imaging module under the screen, and reduces the amplitude of the environment light interference by 50 percent. Meanwhile, the attenuation of effective signal light can be avoided, the signal-to-noise ratio of the effective signal light is improved, the power consumption of the whole system is reduced, and the light energy utilization rate of the system is improved.

For the light source of the vertical cavity surface emitting laser with the high-contrast grating adopted in the embodiment of the present invention, the wavelength generally has 850N, 940nm, and the like, and those skilled in the art can know that the specific structure of the light source can include an N electrode layer, an active layer, an oxide layer, a first high-refractive-index contrast grating layer and a P electrode layer which are sequentially stacked along the light emitting direction, an N-type distributed bragg reflector layer or a second high-refractive-index contrast grating layer is further disposed between the N electrode layer and the active layer, and a P-type distributed bragg reflector layer or a third high-refractive-index contrast grating layer is further disposed between the oxide layer and the first high-refractive-index contrast grating layer, and no limitation is made here. Compared with a conventional VCSEL (vertical cavity surface laser), the high-contrast grating VCSEL has a high reflectivity only for light with a specific polarization direction (for convenience of explanation, it is assumed that the polarization direction of the polarized light is perpendicular to the paper surface, and the polarization direction can be adjusted by adjusting the structure of the HCG), and has a lower reflectivity for light perpendicular to the polarization direction (for example, light with the polarization direction parallel to the paper surface), so that only light with the polarization direction perpendicular to the paper surface can obtain a higher gain, and finally, light emitted by the high-contrast grating VCSEL is polarized light with the polarization direction perpendicular to the paper surface, and polarized laser with different wavelengths and different polarization characteristics can be obtained by adjusting the structures such as the grating period and the thickness of the HCG.

In addition, the display panel 30 adopted in the embodiment of the present invention may be any one of a liquid crystal display panel, an organic light emitting display panel, and an inorganic light emitting display panel, and the inorganic light emitting display panel may be a micro-led display panel, a mini-led display panel, or a nano-led display panel, which is not limited herein. In addition, in the terminal display module according to the embodiment of the present invention, the terminal display module may further include a control calculation module 40, and the control calculation module 40 is electrically connected to the transmitting module 10 and the receiving module 20, respectively, and is configured to control the transmitting module 10 to transmit the structural light beam and the floodlight beam at intervals, and further control the receiving module 20 to receive the structural light reflected beam and the floodlight reflected beam transmitted by the linear polarization layer 320 at intervals. In addition, the control calculation module 40 can also perform image recognition according to the speckle characteristic image and the uniform infrared image received by the receiving module 20, wherein the image recognition includes processing the received infrared speckle characteristic image to obtain a depth map of the target scene, and the depth map increases the depth information of the target scene, so that a plane attack means can be effectively responded.

With continuing reference to fig. 2 and fig. 3, in the foregoing embodiment, the emission module 10 further includes a collimating unit 14 and a diffractive optical element 15, the collimating unit 14 and the diffractive optical element 15 are sequentially arranged on light emitting sides of the structured light source 11 and the floodlight source 13, a light emitting surface of the structured light source 11 is located on a focal plane of the collimating unit 14, and a light emitting surface of the floodlight source 13 is located on a virtual focal plane of the collimating unit 14; the collimating unit 14 is configured to collimate the structured light beam emitted from the structured light source 11, and the diffractive optical element 15 is configured to replicate and diffuse the collimated structured light beam.

In this emission module 10, collimating unit 14 and diffractive optical element 15 are responsible for converting the structured light beam of structured light source 11 outgoing into speckle characteristic image, and wherein, diffractive optical element 15 can convert the input light of collimation into the highly even facula of energy distribution, and after object reflection, this facula image can carry the three-dimensional information of object, can be used for forming speckle characteristic image for realize 3D structured light formation of image.

The collimating unit 14 may be specifically a collimating projection, and may also be a phase surface optical element with a collimating microstructure, which is mainly responsible for collimating the structured light beam emitted from the structured light source 11, so that the light emitting surface of the structured light source 11 should be arranged on the focal plane of the collimating unit 14. However, for the floodlight source 13, it is necessary to form uniform scattered light after passing through the collimating unit 14 and the diffractive optical element 15, and therefore, it is necessary to arrange the light emitting surface thereof on the virtual focal plane of the collimating unit 14 to avoid the collimating unit 14 collimating the floodlight beam emitted from the floodlight source 13. With continued reference to fig. 2 and 3, the emission module further includes a circuit board (not shown), and the structured light source 11 and the flood light source 13 are disposed on the circuit board. To ensure that the light emitting surface of the structured light source 11 is located at the focal plane of the collimating unit 14 and the light emitting surface of the floodlight source 13 is located at the virtual focal plane of the collimating unit 14, the positions of the structured light source 11 and the floodlight source 13 need to be reasonably adjusted in the direction perpendicular to the collimating unit 14. In particular, a conductive gasket 12 may be provided between the floodlight source 13 and the circuit board. Wherein, all integrate structured light source 11 and floodlight source 13 on same circuit board, can improve emission module 10's integrated level, reduce emission module 10 volume to help realizing the miniaturization to a certain extent. The conductive gasket 12 is mainly responsible for raising the position of the floodlight source 13, namely forming a certain height difference with the structured light source 11, so as to avoid light beam collimation as the light emitting surface is positioned on the focal plane of the collimation unit 14, besides ensuring the electrical connection between the floodlight source 13 and the circuit board. The conductive pad 12 may be a copper sheet, a ceramic substrate, or other materials with electrical conduction function, and is not limited herein.

Still referring to fig. 2 and fig. 3, the receiving module 20 may include an imaging chip 21, a narrowband filter 22 and an imaging lens 23, the narrowband filter 22 and the imaging lens 23 are sequentially arranged on a light receiving side of the imaging chip 21, and the light receiving side of the imaging chip 21 is located on a focal plane of the imaging lens 23; the narrow-band filter 22 is used for filtering out light rays in wave bands except for the emission structure light beam and the floodlight beam; the imaging lens 23 is used to focus the structured-light reflected beam or the floodlight reflected beam on the light receiving surface of the imaging chip 21.

As known to those skilled in the art, the imaging chip 21, the narrowband filter 22 and the imaging lens 23 are conventional structures of the receiving module 20, and the imaging process thereof is not described herein again. It should be noted that the imaging chip 21 and the narrowband filter 22 need to be arranged in cooperation with a light source. Taking an infrared light source as an example, the imaging chip 21 and the narrowband filter 22 should be an infrared imaging chip and an infrared narrowband filter, respectively, that is, the narrowband filter 22 only has a transmission effect on light rays in an infrared band emitted from the light source, and the remaining bands are cut off at the narrowband filter 22. The imaging chip 21 has a good imaging function only for the light of the infrared band emitted by the light source, and can realize clear imaging of the floodlight beam and the structured light beam.

Fig. 4 is a schematic structural diagram of another emission module of the terminal display module according to the embodiment of the present invention, and referring to fig. 4, the difference from the above embodiment is that the emission module includes a collimation-diffraction integrated diffractive optical element 151, the collimation-diffraction integrated diffractive optical element 151 is located on the light exit side of the structured light source 11 and the floodlight source 13, the light emitting surface of the structured light source 11 is located on the focal plane of the collimation-diffraction integrated diffractive optical element 151, and the light emitting surface of the floodlight source 13 is located on the virtual focal plane of the collimation-diffraction integrated diffractive optical element 151; the collimating-diffracting integrated diffractive optical element 151 is used to collimate, replicate, and diffuse a structured light beam emitted from a structured light source.

In this embodiment, the collimating-diffracting integrated diffractive optical element 151 is substantially formed by integrating a collimating unit and a diffractive optical element, and has the light beam collimating function of the collimating unit, and the light beam replicating and diffusing functions, which can form a speckle feature image based on the same principle, and is used for realizing 3D structured light imaging. The upper and lower surfaces of the collimating-diffracting integrated diffractive optical element 151 can be respectively composed of a collimating microstructure image plane and a diffracting microstructure phase plane, the collimating microstructure phase plane can be a fresnel microstructure surface, of course, the same surface can also be a structure plane integrating collimating and diffracting functions at the same time, and those skilled in the art can design and select the collimating microstructure image plane and the diffracting microstructure phase plane according to actual conditions, and the collimating microstructure phase plane and the diffracting microstructure phase plane are not limited herein. It can be understood that, because the collimating unit and the diffractive optical element are integrated in the embodiment, the number of elements of the transmitting module can be reduced, the size of the transmitting module is reduced, the cost is saved, and the miniaturization design of the module is facilitated.

Fig. 5 is a schematic structural diagram of another emission module of the terminal display module according to an embodiment of the present invention, and referring to fig. 5, in this embodiment, the selectable structured light source 11 is multiplexed into the floodlight source 13; the emission module 10 further comprises an electric control diffusion sheet 16, the electric control diffusion sheet 16 is located on the light emitting side of the structured light source 11, and the electric control diffusion sheet 16 is used for transmitting the structured light beam emitted by the structured light source in the structured light beam emitting stage and scattering the structured light beam emitted by the structured light source to form a floodlight beam in the floodlight beam emitting stage; wherein the structured light beam emergence phase and the flood light beam emergence phase do not overlap in time.

As can be seen from the above embodiment, since the structured light source 11 and the floodlight source 13 both use the high-contrast grating vcsel as the light source, it is considered that the structured light source 11 and the floodlight source 13 are multiplexed, so as to reduce one high-contrast grating vcsel, thereby saving the cost and reducing the size of the emission module. In this embodiment, since the structured light source 11 and the flood light source 13 are multiplexed, an electrically controlled diffusion sheet 16 may be further disposed in the emission module 10 to ensure the normal operation of the independent functions of the two light sources. It will be appreciated that although the structured-light source 11 is multiplexed into the flood light source 13, the emitted light beam is still a structured-light beam in nature. The electric control diffusion sheet 16 is mainly used for ensuring that the floodlight source 13 emits uniform scattered light and converting the structured light beam emitted by the structured light source into the floodlight beam, so that the requirement of planar imaging is met. The electric control diffusion sheet 16 can be made of polymer liquid crystal, when not powered on, the optical axis of liquid crystal droplets in the polymer liquid crystal is in free orientation, the refractive index of the liquid crystal droplets is not consistent with that of the polymer, so that the electric control diffusion sheet 16 is in a scattering state, namely fog, and light beams passing through the electric control diffusion sheet 16 are scattered into uniform light beams, thereby meeting the requirements of floodlight beams and realizing plane imaging of the floodlight beams. When power is applied, the optical axis orientation of liquid crystal droplets in the polymer liquid crystal can be changed, when voltage is applied to a certain degree, the refractive index of the liquid crystal droplets is consistent with that of the surrounding polymers, the electric control diffusion sheet 16 is in a transparent state, and light beams passing through the electric control diffusion sheet 16 are directly transmitted and still form structured light beams, so that three-dimensional imaging of the structured light beams is realized. Therefore, the three-dimensional imaging module can be respectively in a floodlight beam emergence stage and a structured light beam emergence stage through the power-on control of the electric control diffusion sheet 16, and floodlight beam imaging and structured light beam imaging are respectively carried out in the two stages.

It should be noted that, in the embodiment, the collimating-diffracting integrated diffractive optical element 151 is disposed in the emitting module 10, so as to reduce the number of elements of the emitting module 10, improve the integration level, save the cost, and facilitate the miniaturization of the module. In other embodiments of the present invention, it is also contemplated to replace the collimating-diffracting integrated diffractive optical element 151 with a collimating unit and a diffractive optical element, which are not illustrated in the drawings herein.

With continued reference to fig. 2 and 3, in an alternative embodiment of the present invention, a linear polarization layer 320 may be disposed on a side surface of the display panel 30 facing the receiving module 20. The linear polarization layer 320 is specifically a linear polarization film, and can be directly attached to the surface of the display panel 30 during the preparation process. In another embodiment of the present invention, the optional linear polarization layer is disposed inside the receiving module. Fig. 6 is a schematic structural diagram of another receiving module of the terminal display module according to the embodiment of the present invention, referring to fig. 6, optionally, the linear polarization layer 320 is located in the receiving module 20, specifically, the linear polarization layer 320 is a polarizer 24, and as shown in fig. 6, the polarizer 24, the imaging lens 23 and the narrow-band filter 22 are sequentially arranged on the light incident side of the imaging chip 21.

By introducing the polarizer into the receiving module 20, randomly polarized light in the ambient light, which is not in accordance with the transmission axis direction of the polarizer, can be intercepted, so that the interference of the ambient light can be reduced by 50%, and the signal-to-noise ratio of the infrared image can be increased. Of course, the polarizer may be disposed between the imaging lens 23 and the narrowband filter 22, or between the narrowband filter 22 and the imaging chip 21, and is not illustrated here.

Fig. 7 is a schematic structural diagram of another terminal display module according to an embodiment of the present invention, and fig. 8 is a partially enlarged view of the terminal display module shown in fig. 7, referring to fig. 7 and fig. 8, in this embodiment, a display panel 30 includes a circular polarizer 321, the circular polarizer 321 includes a polarizer 3211 and a first quarter-wave plate 3212, and the polarizer 3211 is multiplexed into a linear polarization layer 320. The polarizer 3211 and the first quarter-wave plate 3212 are sequentially stacked in the light exit direction of the display panel 30, and the fast axis direction of the first quarter-wave plate 3212 forms an angle of 45 ° with the transmission axis direction of the polarizer 3211. The emitting module 10 further includes a second quarter-wave plate 17, and an included angle of 45 ° is formed between the fast axis direction of the second quarter-wave plate 17 and the polarization direction of the linearly polarized light emitted by the high-contrast grating vertical cavity surface emitting laser.

As can be understood by those skilled in the art, for the organic light emitting display panel, a metal layer with high reflectivity to the external environment light is disposed inside the organic light emitting display panel, and the display is affected by the mirror effect of the panel due to the reflection of the external light. The difference from the above embodiments is that the display panel 30 in this embodiment is provided with a circular polarizer 321, which is mainly used for reducing reflection of the display panel, especially the main display area, to avoid the interference of metal layer reflection on normal display. Therefore, in the present embodiment, the quarter-wave plate is disposed in the emission module 10 to ensure the imaging function of the three-dimensional imaging module and reduce the ambient light interference function in cooperation with the circular polarizer.

Fig. 9 is a schematic diagram of the polarization state of light in the terminal display module shown in fig. 7, referring to fig. 7-9, firstly, the circular polarizer 321 includes a polarizer 3211 and a first quarter-wave plate 3212, for the display panel 30, when external natural light (arrows in multiple directions indicate the polarization state of ambient light in the figure) enters the display panel 30 through the circular polarizer 321, it needs to be converted into linearly polarized light (the polarization direction is indicated by black dots in the figure to be perpendicular to the paper surface) through the polarizer 3211, that is, polarized light in other directions different from the transmission axis of the polarizer 3211 is absorbed, and since the transmission axis of the polarizer 3211 is 45 ° to the fast axis of the first quarter-wave plate 3212, the linearly polarized light transmitted through the polarizer 3211 is converted into left-circularly polarized light (which may also be right-circularly polarized light) through the first quarter-wave plate 3212, and the left-circularly polarized light is reflected by a metal layer inside the display panel 30, forming right-handed polarized light (or left-handed polarized light); the right-handed polarized light is converted again by the first quarter-wave plate 3212 to form linearly polarized light (in the figure, the polarization direction is parallel to the paper surface by a parallel straight line), and the linearly polarized light is perpendicular to the polarization direction of the incident linearly polarized light, that is, perpendicular to the transmission axis of the polarizer 3211, and is absorbed by the polarizer 3211, so that the attenuation and reflection of the ambient light are realized by the circular polarizer 321.

Meanwhile, in the embodiment of the present invention, the second quarter-wave plate 17 is disposed in the emission module 10, and the fast axis direction of the second quarter-wave plate forms an included angle of 45 ° with the polarization direction of the linearly polarized light emitted from the high-contrast grating vcsel, so that the linearly polarized light (for example, the direction perpendicular to the paper surface) emitted from the structured light source and the flood light source can be converted into a left-handed circularly polarized light (or a right-handed polarized light) in the same polarization state as the first quarter-wave plate 3212 in the circular polarized light, and the left-handed polarized light can be converted into the linearly polarized light (the polarization direction perpendicular to the paper surface) after passing through the first quarter-wave plate 3212, and the linearly polarized light can be emitted through the polarizer 3211. The linearly polarized light can continue to return through the polarizer 3211 and the first quarter-wave plate 3212 after being reflected by an external object, and is incident into the receiving module 20, and the receiving module 20 can realize floodlight imaging and structured light imaging. It is worth emphasizing that here the limitation of the fast axis direction of the second quarter-wave plate 17 and the polarization direction of the linearly polarized light exiting the light source is mainly aimed at converting the linearly polarized light into circularly polarized light. The arrangement of the fast axis direction of the first quarter-wave plate 3212 and the transmission axis direction of the polarizer 3211 not only reduces the reflection of the external environment light, but also ensures that the polarization direction of the circularly polarized light emitted from the second quarter-wave plate 17 is consistent with the transmission axis of the polarizer 3211 after the circularly polarized light is converted into linearly polarized light by the first quarter-wave plate 3212, so that the part of the light can be emitted normally, and further can be returned after being reflected by an external object.

Based on the same filtering principle of the linear polarizer layer, for external natural light, after being transmitted by the circular polarizer 321, 50% of the light is also absorbed by the polarizer 3211, that is, the imaging of ambient light on the receiving module 20 reduces the noise-to-noise ratio of the final image, thereby greatly reducing the influence of the ambient light on the imaging quality of the receiving module.

It should be noted that the second quarter-wave plate 17 is disposed on the light-emitting side of the diffractive optical element 15 in this embodiment, which is only an example, and in other embodiments of the present invention, it may be disposed between the light source and the collimating unit or between the collimating unit and the diffractive optical element.

With continued reference to fig. 7 and 8, the display panel 30 includes an organic light emitting unit 322 and a driving circuit (not shown in the figure) for driving the organic light emitting unit 322 to emit light. In the embodiment of the present invention, in consideration of the imaging effect of the three-dimensional imaging module, the transmittance problem of the auxiliary display area 32 needs to be improved, for example, by performing special processing on the film structure in the auxiliary display area 32, for example, reducing the density or size of the organic light emitting units 322 in the auxiliary display area 32, or optimizing the layout of the circuit traces in the auxiliary display area 32, so as to improve the transmittance of the auxiliary display area 32 to the light beam emitted by the three-dimensional imaging module. Specifically, the pitch of the organic light emitting units 322 in the auxiliary display area 32 may be set to be greater than the pitch of the organic light emitting units 322 in the main display area 31, and/or the trace pitch of the driving circuit in the auxiliary display area 32 may be set to be greater than the trace pitch of the driving circuit in the main display area 31.

The anode layer 3223 in the organic light emitting unit 322 is generally made of opaque ITO material with high work function, and an opaque metal trace is present in the driving circuit. Therefore, in the case where the organic light emitting unit 322 is disposed in the auxiliary display area 32, adjustment can be optionally performed for the organic light emitting unit 322 and the driving circuit, so that the light transmission area is increased, and the transmittance of the auxiliary display area is improved. Specifically, the distance between the organic light emitting units 322 and the distance between the wires in the driving circuit can be increased, so that the area of the light-transmitting region is increased, and the transmittance of the auxiliary display region is improved as a whole.

Fig. 10 is another partial enlarged view of the terminal display module shown in fig. 7, fig. 11 is a schematic view of a polarization state of light in the terminal display module shown in fig. 10, and referring to fig. 7, fig. 10 and fig. 11, in another embodiment of the present invention, the display panel 30 further includes an array substrate 323 and a plurality of organic light emitting units 322 disposed on the array substrate 323, the organic light emitting units 322 are arranged in an array on a plane where the array substrate 323 is located, and the organic light emitting units 322 include an anode layer 3223, an organic light emitting layer 3222 and a cathode layer 3221. On this basis, the region between adjacent organic light emitting cells 322 may also be selected to constitute a spacer 33; in the auxiliary display area 32, a perpendicular projection of the cathode layer 3221 on the plane of the array substrate 323 does not overlap with the spacer area 33.

The array substrate 323 may include a transparent substrate 3231 and a circuit layer 3232, the circuit layer 3232 is generally composed of TFT (thin film transistor) and capacitor, and provides a driving voltage for the organic light emitting unit 322, and is disposed at a position directly below the organic light emitting unit anode layer 3223, and the transparent substrate 3231 is made of glass or plastic, and provides structural support for the multilayer film structure of the organic light emitting unit 322. In the organic light emitting unit 322, the cathode layer 3221 transmits electrons to the organic light emitting layer 3222, the anode layer 3223 transmits holes to the organic light emitting layer 3222, the electrons and the holes meet at the organic light emitting layer 3222 to form excitons, and the excitons radiatively jump to emit photons. By adjusting the voltage reaching the anode layer 3223, the luminance of the organic light emitting layer 3222 can be adjusted, and the organic light emitting unit 322 is an individual light emitting pixel. The different organic light emitting units 322 have a certain interval, that is, the above-mentioned interval 33, the interval may be composed of transparent pixel defining layers, the cathode layer 3221 generally covers the whole organic display panel area, the anode layer 3223 is etched on the array substrate 323 through the photolithography process, the different organic light emitting units 322 have separate anode layers 3223, and the external light beam passes through the circular polarizer 321, the cathode layer 3221, and passes through the array substrate 323 through the interval 33 to reach the receiving module 20 of the three-dimensional imaging module for imaging. In this embodiment, by setting that the vertical projection of the cathode layer 3221 in the plane where the array substrate 323 is located in the auxiliary display area 32 is not overlapped with the spacer 33, the shielding of the cathode layer 3221 on the light emitted by the three-dimensional imaging module can be avoided, and meanwhile, the shielding on the external incident light can also be avoided, which helps to improve the transmittance of the auxiliary display area, avoid the influence of the transmittance of the display panel on the three-dimensional imaging, and improve the imaging definition of the three-dimensional imaging module. Specifically, the cathode layer 3221 of the entire display panel in this embodiment may form a certain cathode pattern, which may be automatically formed by a deposition process with a mask, such as thermal evaporation, magnetron sputtering, or physical chemical vapor deposition, or may be formed by patterning the entire cathode conductive layer, such as by removing a portion in the spacer 33 by a laser etching process or a photolithography process, and leaving a region not overlapping with the spacer 33.

Fig. 12 is a schematic structural diagram of another terminal display module according to an embodiment of the present invention, fig. 13 is a partially enlarged view of the terminal display module shown in fig. 12, fig. 14 is a schematic diagram of a polarization state of light in the terminal display module shown in fig. 12, and referring to fig. 12 to fig. 14, in another embodiment of the present invention, a display panel 30 includes a circular polarizer 321, the circular polarizer 321 includes a polarizer 3211 and a first quarter-wave plate 3212, and the polarizer 3211 is multiplexed into a linear polarization layer 320; the polarizer 3211 and the first quarter-wave plate 3212 are sequentially stacked in the light exit direction of the display panel 30, a fast axis direction of the first quarter-wave plate 3212 forms an angle of 45 ° with a transmission axis direction of the polarizer 3211, and a polarization direction (a polarization direction is indicated by a black dot in the figure as a direction perpendicular to the paper surface) of linearly polarized light emitted from the high-contrast grating vcsel is the same as the transmission axis direction of the polarizer 3211. The display panel 30 further includes an array substrate 323 and a plurality of organic light emitting units 322 disposed on the array substrate 323, the organic light emitting units 322 are arranged in an array on a plane of the array substrate 323, and each organic light emitting unit 322 includes an anode layer 3223, an organic light emitting layer 3222, and a cathode layer 3221. The region between the adjacent organic light emitting cells 322 constitutes a spacer 33; in the auxiliary display area 32, the perpendicular projection of the first quarter waveplate 3212 on the plane of the array substrate 323 does not overlap with the spacer area 33.

Referring to fig. 14, as can be seen from the above, the polarizer 3211 and the first quarter-wave plate 3212 can attenuate external natural light, and are not described herein again. In this embodiment, the vertical projection of the first quarter-wave plate 3212 on the plane of the array substrate 323 is not overlapped with the spacer 33, so that the first quarter-wave plate 3212 can prevent the light emitted from the three-dimensional imaging module from being blocked, and the light incident from the outside can be prevented from being blocked, thereby improving the transmittance of the auxiliary display area, preventing the transmittance of the display panel from affecting the three-dimensional imaging, and improving the imaging resolution of the three-dimensional imaging module. The difference between this embodiment and the embodiment shown in fig. 7 is that the emitting module 10 does not need to be provided with the second quarter-wave plate 17, and since the polarization direction (illustrated as a direction perpendicular to the paper surface in the figure) of the linearly polarized light emitted from the light source is the same as the light transmission axis direction of the polarizer 3211, in the spacer 33, the linearly polarized light emitted from the light source can be completely emitted through the polarizer 3211 after passing through the array substrate 323 and the cathode layer 3221, and the polarized light can be reflected by an external object and then can still be completely incident into the receiving module 20 through the polarizer 3211, thereby ensuring the imaging function of the three-dimensional imaging module.

Fig. 15 is another partial enlarged view of the terminal display module shown in fig. 12, and fig. 16 is a schematic view of a polarization state of light in the terminal display module shown in fig. 15, and in yet another embodiment of the present invention, referring to fig. 10 and 11, a vertical projection of a cathode layer 3221 in a plane where the array substrate 323 is located in the auxiliary display area 32 is not overlapped with the spacer 33, so as to further increase a transmittance of the auxiliary display area, avoid an influence of the transmittance of the display panel on three-dimensional imaging, and improve an imaging effect of the three-dimensional imaging module, which is not repeated herein.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A terminal display module is characterized by comprising a display panel and a three-dimensional imaging module, wherein the three-dimensional imaging module is positioned on one side of the display panel, which is far away from the light emitting side;

the receiving module is used for receiving the structural light reflected beams and the floodlight reflected beams transmitted by the linear polarization layer at intervals and respectively forming speckle characteristic images and uniform images;

the display panel comprises a circular polarizer, the circular polarizer comprises a polarizer and a first quarter-wave plate, and the polarizer is multiplexed into the linear polarization layer;

the polaroid and the first quarter-wave plate are sequentially stacked in the light emergent direction of the display panel, and the fast axis direction of the first quarter-wave plate and the transmission axis direction of the polaroid form an included angle of 45 degrees;

the transmitting module further comprises a second quarter-wave plate, and the fast axis direction of the second quarter-wave plate forms an included angle of 45 degrees with the polarization direction of the linearly polarized light emitted by the high-contrast grating vertical cavity surface emitting laser; or the display panel further comprises an array substrate and a plurality of organic light-emitting units arranged on the array substrate, wherein the organic light-emitting units are arranged in an array on the plane of the array substrate and comprise an anode layer, an organic light-emitting layer and a cathode layer; the area between the adjacent organic light-emitting units forms a spacer; in the auxiliary display area, the vertical projection of the first quarter-wave plate on the plane of the array substrate does not overlap with the spacing area.

2. The terminal display module of claim 1, wherein the emission module further comprises a collimating unit and a diffractive optical element, the collimating unit and the diffractive optical element are sequentially arranged on light-emitting sides of the structured light source and the floodlight source, a light-emitting surface of the structured light source is located on a focal plane of the collimating unit, and a light-emitting surface of the floodlight source is located on a virtual focal plane of the collimating unit;

the collimating unit is used for collimating the structured light beam emitted by the structured light source, and the diffractive optical element is used for copying and diffusing the collimated structured light beam.

3. The terminal display module of claim 1, wherein the emission module further comprises a collimation-diffraction integrated diffractive optical element located on the light exit side of the structured light source and the flood light source, the light emitting face of the structured light source being located on the focal plane of the collimation-diffraction integrated diffractive optical element, and the light emitting face of the flood light source being located on the virtual focal plane of the collimation-diffraction integrated diffractive optical element;

the collimation-diffraction integrated diffraction optical element is used for collimating, copying and diffusing the structured light beam emitted by the structured light source.

4. A terminal display module according to claim 2 or 3, wherein the structured light source is multiplexed into the floodlight source;

the emission module further comprises an electric control diffusion sheet, the electric control diffusion sheet is located on the light emitting side of the structured light source, and the electric control diffusion sheet is used for transmitting the structured light beams emitted by the structured light source in the structured light beam emitting stage and scattering the structured light beams emitted by the structured light source in the floodlight beam emitting stage to form floodlight beams; wherein the structured-light beam emergence period and the flood beam emergence period do not overlap in time.

5. The terminal display module according to claim 1, wherein the receiving module comprises an imaging chip, a narrowband filter and an imaging lens, the narrowband filter and the imaging lens are sequentially arranged on a light receiving side of the imaging chip, and the light receiving surface of the imaging chip is located on a focal plane of the imaging lens;

the narrow-band filter is used for filtering out light rays of wave bands except the emission structure light beam and the floodlight beam; the imaging lens is used for focusing the structural light reflection beam or the floodlight reflection beam on the light receiving surface of the imaging chip.

6. The terminal display module of claim 1, wherein in the auxiliary display area, a perpendicular projection of the cathode layer on a plane of the array substrate does not overlap with the spacer area.

7. A mobile terminal, characterized in that it comprises a terminal display module according to any one of claims 1 to 6.