WO2022246698A1

WO2022246698A1 - Display apparatus and adjustment method for display apparatus

Info

Publication number: WO2022246698A1
Application number: PCT/CN2021/096116
Authority: WO
Inventors: 杨亮; 刘永俊; 董明杰
Original assignee: 华为技术有限公司
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-12-01
Also published as: CN116964515A

Abstract

A display apparatus (40) and an adjustment method for the display apparatus (40). The display apparatus (40) comprises at least one display unit (240), and the display unit (240) comprises a first control circuit (41), a first light-emitting pixel (43), a polarization layer (44), a second control circuit (42), and a nano antenna structure (45). The second control circuit (42) can be connected to the polarization layer (44), and a certain voltage is applied to the polarization layer (44) to change the polarization direction of a second light beam emitted from the polarization layer (44), so as to change the scattering angle of a third light beam emitted from the nano antenna structure (45); when the second control circuit (42) is connected to the nano antenna structure (45), on the basis of material characteristics of the nano antenna structure (45), a certain voltage is applied to the nano antenna structure (45) to change the scattering angle of the third light beam. The two connection structures both change the scattering angle of the third light beam, such that switching between a wide angle range and a narrow angle range is achieved, thereby achieving an anti-peeping effect.

Description

A display device and a method for adjusting the display device

technical field

The present application relates to the field of optics, in particular to a display device and a method for adjusting the display device.

Background technique

With the popularization of various electronic devices, using screens to display text, pictures, videos and other content has become the main way for people to obtain information. At present, the display viewing angle of most electronic screens is a wide-angle mode, as shown in FIG. 1A . This means that not only the user (principal viewer) can see the information on the screen, but also the surrounding bystanders. However, in some scenarios, such as processing important documents in temporary places such as conference venues, waiting halls, and coffee shops, or browsing personal information and viewing subscriptions in small environments such as subways and elevators, users of electronic devices do not want to be surrounded by people The information on the screen is seen by interested bystanders, so electronic screens sometimes need to be protected from peeping eyes. This anti-peeping function can generally be realized by reducing the display viewing angle of the electronic screen, as shown in FIG. 1B .

In the industry, the easiest way to realize the privacy function is to paste a privacy film on the screen. There is an array of light-shielding elements inside the privacy film to block the outgoing light at a specific angle, thereby realizing the limitation of the display viewing angle. When using this kind of anti-spy film, there will be some inconvenient factors, such as certain requirements for the film technology, and it is difficult to reuse after pasting. For this situation, users hope to have a better solution to reduce the difficulty of use, increase the flexibility of use, and even provide more novel display functions. In order to meet such demands, integrated devices with dynamically adjustable display angles are gradually becoming part of electronic screens.

Contents of the invention

The present application provides a display device and an adjustment method for the display device, which are used to provide different display modes, and when the display mode is a viewing angle with a narrow scattering angle, the effect of anti-peeping can be achieved. Specifically, the application discloses the following technical solutions:

In a first aspect, the present application provides a display device, which includes at least one display unit, and each display unit includes: a first control circuit, a light-emitting pixel, a polarization layer, a second control circuit and a nano-antenna structure, wherein the first control circuit is connected to the light-emitting pixel, and the first control circuit applies a voltage to the light-emitting pixel, so that the light-emitting pixel emits a first light beam to the polarization layer; the The polarizing layer is arranged on the light-emitting side of the light-emitting pixel, and can be used to control the polarization direction of the second light beam, and the second light beam is the outgoing light beam after the first light beam passes through the polarizing layer; the The nano-antenna structure is arranged on the side of the polarizing layer away from the light-emitting pixels, and is used to control the scattering angle of the third light beam, and the third light beam is an outgoing light beam after the second light beam passes through the nano-antenna structure. The second control circuit is connected with the polarization layer or the nano-antenna structure, and is used to change the scattering angle of the third light beam.

Wherein, the polarizing layer includes liquid crystal molecules, and the liquid crystal molecules are used to regulate the polarization of the light emitted by the light-emitting pixels.

In the technical solution provided by this aspect, when the second control circuit is connected to the polarization layer, the second control circuit applies a certain voltage to the polarization layer, so that after the first light beam generated by the light-emitting pixel enters the polarization layer, changes The polarization direction of the second light beam, the second light beam is the light beam emitted by the first light beam through the polarized layer, and the second light beam passes through the nano-antenna structure and then emits the third light beam. When the scattering angle of the emitted third light beam is compared to Before the voltage is applied, it becomes smaller, so the smaller scattering angle can prevent peeping from changing the front part of the scattering range. When the scattering angle of the third beam is changed to a narrow angle, that is, the minimum scattering angle, the scattering direction is the forward direction. At this time, the The display device is in an anti-peeping display mode, which can effectively prevent peeping.

In addition, when the second control circuit is connected to the nano-antenna structure, the second control circuit applies a certain voltage to the nano-antenna structure, thereby changing the scattering angle of the third beam emitted from the nano-antenna structure, so that the The scattering angle of the third light beam is switched in different ranges. When the scattering angle of the emitted third light beam is a narrow angle and the scattering direction is a forward direction, the display device forms a viewing angle with a narrow scattering angle. At this time, the display device It is an anti-peeping display mode, which can effectively prevent peeping.

It should be noted that the display device in the embodiment of the present application is preset with different scattering angles before the device leaves the factory, and different scattering angles correspond to different display ranges. For example, the display device is configured with two scattering angles, respectively Scatter Angle 1 and Scatter Angle 2. Wherein, the scattering angle 1 is greater than the scattering angle 2, when the display device displays in the range of the scattering angle 1, it is the normal display mode; when the display device displays in the range of the scattering angle 2, it is the anti-peeping mode.

With reference to the first aspect, in a possible implementation manner of the first aspect, the second control circuit is connected to the polarization layer or the nano-antenna structure, and is used to change the scattering angle of the third light beam, including : the second control circuit is connected to the polarization layer or the nano-antenna structure, and is used to switch the working mode of the nano-antenna structure between satisfying the Kerker condition and not satisfying the Kerker condition .

When the working mode of the nano-antenna structure satisfies the Kerker condition, the scattering angle of the third light beam is a first angle, and the first angle is a narrow scattering angle; when the working mode of the nano-antenna structure does not satisfy In the Kerker condition, the scattering angle of the third light beam is a second angle, the second angle is a wide scattering angle, and the first angle is different from the second angle.

Wherein, when the working mode of the nano-antenna structure satisfies the Kerker condition, the first angle displayed corresponds to the anti-peeping display mode; when the Kerker condition is not satisfied, the second angle displayed corresponds to the normal display model.

With reference to the first aspect, in another possible implementation manner of the first aspect, the second control circuit is connected to the polarization layer, and is used to change the scattering angle of the third light beam, including: the The second control circuit is connected to the polarization layer, and the second control circuit applies a voltage to the polarization layer to change the polarization direction of the second light beam; the polarization direction of the second light beam changes When , the scattering angle of the third light beam changes.

Wherein, the nano-antenna structure includes a nano-antenna, and the nano-antenna includes at least one of the following: a cubic nano-antenna, a cylindrical nano-antenna or a combined nano-antenna.

With reference to the first aspect, in yet another possible implementation manner of the first aspect, changing the polarization direction of the second light beam includes: changing the polarization direction of the second light beam so that the polarization direction of the second light beam The polarization direction is parallel to the length of the bottom surface of the cube nano-antenna or the composite nano-antenna; or, the polarization direction of the second light beam is changed so that the polarization direction of the second light beam is parallel to that of the cylinder The long axes of the bottom surface of the nano-antenna are parallel.

In this implementation, the second control circuit is used to apply a certain voltage to the polarizing layer, which can change the polarization direction of the incident light (first light beam) in the polarizing layer, and make the polarization of the second light beam emitted from the polarizing layer The direction is parallel to the length of the bottom surface of the cubic nanoantenna or composite nanoantenna, or the polarization direction of the second light beam is parallel to the long axis of the bottom surface of the cylindrical nanoantenna, so that the working mode of the nanoantenna structure satisfies the Kerker condition , forming a narrow scattering angle to achieve the effect of anti-peeping.

With reference to the first aspect, in yet another possible implementation manner of the first aspect, the nano-antenna structure includes an adjustable material.

Wherein, the second control circuit is connected with the nano-antenna structure, and is used to change the scattering angle of the third light beam, including: the second control circuit is connected with the nano-antenna structure, and the second The control circuit applies voltage to the adjustable material to change the properties of the adjustable material; when the properties of the adjustable material change, the scattering angle of the third light beam changes.

With reference to the first aspect, in yet another possible implementation manner of the first aspect, the second control circuit applies a voltage to the adjustable material to change the characteristics of the adjustable material, including: the second control The circuit applies a voltage to the adjustable material to change the adjustable material from an amorphous state to a crystalline state.

With reference to the first aspect, in yet another possible implementation manner of the first aspect, the second control circuit applies a voltage to the adjustable material to change the adjustable material from an amorphous state to a crystalline state, including : the second control circuit applies a voltage to the adjustable material to change the adjustable material from an amorphous state to a crystalline state and change the dielectric constant of the adjustable material.

Wherein, optionally, the tunable material includes: germanium antimony tellurium material.

In this implementation mode, the adjustable material is set to be a germanium antimony tellurium material, and by adjusting the dielectric constant in the germanium antimony tellurium material, the state of the germanium antimony tellurium material can be switched between an amorphous state and a crystalline state, when the When the germanium antimony tellurium material is in a crystalline state, it can excite the pole mode of the nano-antenna structure satisfying the Kerker condition, so that the display device can form a viewing angle with a narrow scattering angle.

With reference to the first aspect, in yet another possible implementation manner of the first aspect, the second control circuit applies a voltage to the adjustable material to change the characteristics of the adjustable material, including: the second control The circuit applies a voltage to the adjustable material to change the adjustable material from a metal state to a dielectric state.

With reference to the first aspect, in yet another possible implementation of the first aspect, the second control circuit applies a voltage to the adjustable material to change the adjustable material from a metal state to a dielectric state, including: The second control circuit applies a voltage to the adjustable material, so that the adjustable material changes from a metal state to a dielectric state, and changes the conductivity of the adjustable material.

Wherein, optionally, the adjustable material includes: vanadium oxide material.

In this implementation mode, the adjustable material is set to be a vanadium oxide material, and the state of the vanadium oxide material can be switched between an amorphous state and a crystalline state by adjusting the electrical conductivity in the vanadium oxide material. When the vanadium oxide material is in In the crystalline state, the pole mode of the nano-antenna structure satisfying the Kerker condition can be excited, so that the display device can form a viewing angle with a narrow scattering angle.

With reference to the first aspect, in yet another possible implementation manner of the first aspect, the adjustable material is a liquid crystal material.

The second control circuit applies a voltage to the adjustable material to change the characteristics of the adjustable material, including: the second control circuit applies a voltage to the adjustable material, and the liquid crystal molecules in the liquid crystal material The direction of the long axis is changed to be parallel to the bottom surface of the nanoantenna.

In this implementation mode, the adjustable material is set as a liquid crystal material, and by adjusting the long axis direction of the liquid crystal molecules in the liquid crystal material, the pole mode of the nano-antenna structure satisfying the Kerker condition can be excited, so that the display device forms a narrow scattering angle viewing angle.

In a second aspect, the present application also provides a method for adjusting a display device, the method is applied to a display device, and the display device is the device described in the various implementation modes of the first aspect, and the method includes: obtaining the first A first instruction of a target user, the first instruction instructs the display device to start the anti-peeping display mode; sends a second instruction to the display device, the second instruction instructs the second control circuit of the display device to The polarizing layer or the nano-antenna structure applies a voltage to change the viewing angle of the display device to the first viewing angle, and the first viewing angle is determined based on the position of the first target user.

In this method, according to the first viewing angle, the display range of at least one display unit in the display device is adjusted, so that the first light beam generated by the light-emitting pixel passes through the polarization layer and then emits the second light beam, and the second light beam passes through the nano-antenna After the structure, the third light beam is emitted. When the scattering angle of the emitted third light beam is a narrow angle and the scattering direction is the forward direction, the Kerker condition is satisfied, and a viewing angle with a narrow scattering angle is formed. At this time, only in the visible angle Users within the viewing angle range can watch the display screen of the display device, while users outside the viewing angle cannot watch the display screen, thereby achieving the beneficial effect of anti-peeping.

With reference to the second aspect, in a possible implementation manner of the second aspect, the location of the target user is a first location; the first viewing angle is based on the first location of the first target user Sure.

The method further includes: acquiring a second location of the first target user, and sending a third instruction to the display device, the third instruction instructing to change the viewing angle of the display device from the first viewing angle to the display device. The angle is changed to the second viewing angle; the second viewing angle is determined based on a second position of the first target user, and the second position is different from the first position.

In this implementation mode, when the position of the target user changes, the position of the target user can also be tracked, and the viewing angle of the display device can be adaptively adjusted according to the moving position of the target user, so as to achieve the beneficial effect of adjusting the display screen to follow the position of the target user , improve user experience.

Among them, the display device in the embodiment of the present application is not only set with different scattering angles before leaving the factory, such as scattering angle 1 and scattering angle 2, but also is set to change the scattering direction by applying a certain voltage through the second control circuit, so as to realize the control of the scattering direction. adjust. For example, when the second control circuit applies the first voltage, such as 10V, to the polarization layer or the nano-antenna structure, the scattering angle of the third light beam is changed to a scattering angle of 2, and a narrow range of scattering angle is formed at this time, and the scattering direction is Forward direction; when fine-tuning the first voltage, for example, when applying a voltage of 10.1V-10.5V, the scattering direction can be adjusted from the forward direction to the left direction, or applying a voltage of 9.9V-9.5V can change the scattering direction from The forward direction is changed to a rightward direction, so that after adjustment, the scattering direction of the third light beam faces the target user, so as to achieve the effect of tracking the target user. It should be noted that no matter whether the adjusted scattering direction is forward, leftward or rightward, the scattering angle is the scattering angle 2, that is, the scattering angle does not change with the change of the scattering direction.

With reference to the second aspect, in another possible implementation manner of the second aspect, the display device includes a first display unit and a second display unit, and the viewing angle of the display device is changed to the first visible angle. viewing angle, including: changing the viewing angle of the first display unit of the display device to the first viewing angle, and changing the viewing angle of the second display unit of the display device to A third viewing angle, wherein the first viewing angle is determined based on the location of the first target user, and the third viewing angle is determined based on the location of the second target user.

This method can also adjust different display units of the display device to display different pictures, and support the needs of multiple users on the same display screen to watch different pictures, and different display units display different viewing angles under the action of different voltages applied to each other, thereby It achieves the beneficial effect that the picture contents watched by multiple users do not interfere with each other and prevent each other from peeping.

In a third aspect, an embodiment of the present application further provides a display adjustment device, which can be used to implement the aforementioned second aspect and the methods in various implementation manners of the second aspect.

Wherein, the device includes: an acquisition unit, a processing unit and a display unit. In addition, the device may further include a sending unit, a storage unit, and the like.

In the fourth aspect, the embodiment of the present application also provides a display device, the display device includes a controller and a display device, wherein the controller and the display device can be connected through a circuit board, and the display device is the aforementioned first aspect and The first aspect is an apparatus in various implementation manners.

The controller includes at least one processor or processing unit.

Specifically, the controller is configured to acquire a first instruction from the first target user, the first instruction instructs the display device to start the anti-peeping display mode; the controller is also configured to send a second instruction to the In the display device, the second instruction instructs the second control circuit of the display device to apply a voltage to the polarization layer or the nano-antenna structure to change the viewing angle of the display device to the first viewing angle. Wherein, the first viewing angle is determined based on the location of the first target user.

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, when the location of the target user is the first location; the controller is further configured to A position determines the first viewing angle.

The controller is further configured to obtain the second location of the first target user, and send a third instruction to the display device, the third instruction instructs to change the viewing angle of the display device from the first The viewing angle is changed to the second viewing angle. The second viewing angle is determined based on a second location of the first target user, and the second location is different from the first location.

With reference to the fourth aspect, in another possible implementation manner of the fourth aspect, the display device includes a first display unit and a second display unit, and the controller is further configured to control the The viewing angle of the first display unit is changed to the first viewing angle, and the viewing angle of the second display unit of the display device is changed to the third viewing angle, the third The viewing angle is determined based on the location of the second target user.

In addition, the display device further includes a memory, and the memory is coupled with the controller.

The memory is used to store computer program instructions; when the controller is used to execute the program instructions, implement the aforementioned second aspect and the methods in various implementation manners of the second aspect.

Optionally, the memory may be set within the controller, or may also be set outside the controller.

Optionally, the display device is a terminal device.

Optionally, the terminal devices include but are not limited to mobile phones, PCs, and tablet computers.

In the fifth aspect, the embodiment of the present application also provides a computer-readable storage medium, in which instructions are stored, so that when the instructions are run on a computer or a processor, they can be used to implement the aforementioned second aspect and second Methods in Various Implementations of Aspect.

In addition, the present application also provides a computer program product, where the computer program product includes computer instructions, and when the instructions are executed by a computer or a processor, the aforementioned second aspect and the methods in various implementation manners of the second aspect can be realized.

Description of drawings

FIG. 1A is a schematic diagram of a wide viewing angle display mode of an electronic screen provided by the present application;

FIG. 1B is a schematic diagram of a narrow viewing angle display mode of an electronic screen provided by the present application;

Fig. 2 is a schematic diagram of light beam scattering in different pole modes provided by the present application;

FIG. 3 is a schematic diagram of a product form of a terminal device provided by the present application;

FIG. 4 is a schematic structural diagram of a display device provided by the present application;

FIG. 5 is a schematic structural diagram of a display unit provided by the present application;

6 is an enlarged schematic view of a nano-antenna structure provided by the present application;

FIG. 7A is a schematic diagram of a nano-antenna structure provided by the present application;

Figure 7B is a schematic diagram of another nano-antenna structure provided by the present application;

FIG. 8 is a schematic structural diagram of another display unit provided by the present application;

FIG. 9 is a schematic diagram of a light beam propagating in a display unit provided by the present application;

FIG. 10A is a schematic diagram of a cube nano-antenna structure for polarized light irradiation provided by the present application;

FIG. 10B is a schematic diagram of another light source polarization irradiation cube nano-antenna structure provided by the present application;

FIG. 10C is a schematic diagram of a nano-antenna structure of a light source polarization irradiation assembly provided by the present application;

FIG. 10D is a schematic diagram of another nano-antenna structure of a light source polarization irradiation assembly provided by the present application;

FIG. 10E is a schematic diagram of a cylindrical nano-antenna structure for polarized irradiation of a light source provided by the present application;

FIG. 10F is a schematic diagram of another light source polarized irradiation cylinder nano-antenna structure provided by the present application;

Fig. 11A is a schematic diagram of a narrow scattering angle display range provided by the present application;

Fig. 11B is a schematic diagram of a wide scattering angle display range provided by the present application;

Fig. 12A is a schematic diagram of a nano-antenna structure comprising tunable materials provided by the present application;

Fig. 12B is a schematic diagram of another nano-antenna structure comprising tunable materials provided by the present application;

Fig. 12C is a schematic diagram of another nano-antenna structure including tunable materials provided by the present application;

Fig. 12D is a schematic diagram of a nano-antenna structure comprising a liquid crystal material provided by the present application;

Fig. 12E is a schematic diagram of a nano-antenna structure comprising liquid crystal material and adjustable material provided by the present application;

FIG. 13 is a schematic diagram of another light beam propagating in a display unit provided by the present application;

Fig. 14 is a schematic diagram of another light beam propagating in a display unit provided by the present application;

FIG. 15A is a schematic diagram of the state of liquid crystal molecules in an adjustable material before voltage is applied according to the present application;

FIG. 15B is a schematic diagram of the state of liquid crystal molecules in an adjustable material after voltage application provided by the present application;

FIG. 16 is a schematic diagram of another light beam propagating in a display unit provided by the present application;

FIG. 17 is a schematic diagram of a scene for adjusting the viewing angle range provided by the present application;

FIG. 18 is a flowchart of a method for adjusting a display device provided by the present application;

FIG. 19 is a schematic diagram of another application scenario for adjusting the viewing angle range provided by the present application;

FIG. 20A is a flow chart of another method for adjusting a display device provided by the present application;

FIG. 20B is a schematic diagram of user B moving from the first location to the second location provided by this application;

FIG. 21 is a schematic diagram of a scene where different content is displayed on a vehicle-mounted terminal provided by the present application;

FIG. 22 is a schematic structural diagram of another display device provided by the present application;

FIG. 23 is a flow chart of another method for adjusting a display device provided by the present application;

FIG. 24 is a schematic structural diagram of another display device provided by the present application;

FIG. 25 is a schematic structural diagram of a display device provided by the present application.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

First, the relevant technical terms and background of this embodiment are introduced.

1. Constitutive parameters

In electromagnetic theory, the constitutive parameters refer to the parameters describing the properties of adjustable materials, and generally mainly include three, namely, dielectric constant, magnetic permeability, and electrical conductivity.

2. Polar mode

An electric dipole is a system of two point charges of equal magnitude and opposite sign. The characteristics of an electric dipole are described by the electric dipole moment p=ql, where l represents the distance between two points of charge, and the directions of l and p are specified from -q to +q. The electric dipole is rotated by the torque in the external electric field, so that its electric dipole moment turns to the direction of the external electric field.

Electric dipole mode: The field distribution is similar, and the field distribution of positive and negative charge systems with equal electric charge. Magnetic dipole mode: the field distribution is similar, the field distribution of the forward current and reverse current loop system with equal electric charge. Electric quadrupole mode: The simplest electric quadrupole means that 4 charges of the same quantity are placed on the 4 vertices of a square, and the two charges on each side have different signs. The electromagnetic field mode it generates is an electric quadrupole mode. Magnetic quadrupole mode: The simplest electric quadrupole means that 4 currents of the same charge are placed on the 4 vertices of a square, and the two currents on each side are in opposite directions. The electromagnetic field mode it generates is a magnetic quadrupole mode.

3. Kerker conditions for nanoantennas

In general, a nanoantenna is a subwavelength-scale optical structure capable of affecting the propagation of light. The materials used to make nanoantennas can be metals or dielectrics. However, metals work differently than media. In metals, freely moving electrons can interact with light, affecting its propagation. In the medium, bound electrons often cannot move freely, but light can form a displacement current inside the medium, thereby affecting the propagation of light.

As a kind of scatterer, the nano-antenna can excite various polarization modes of the nano-antenna when it is irradiated with an appropriate light source (including the irradiation direction and polarization direction of the light source). These polarization modes can include electric dipole modes, magnetic dipole modes, electric quadrupole modes, magnetic quadrupole modes, and even higher order electrode and magnetic pole modes. Moreover, these polarization modes may or may not exist simultaneously. When the electric polarization mode and the magnetic polarization mode exist at the same time, and the Kerker condition is satisfied, forward one-way scattering can be generated. This phenomenon is quite unique because under other conditions the scattering tends to be multidirectional. Specifically, the generalized definition of the Kerker condition is as follows:

Among them, α _e represents the electrical composite scalar polarizability of the nano-antenna itself, α _m represents the magnetic composite scalar polarizability, and the polarization modes corresponding to α _e and α _m are the pole sub-mode and the magnetic pole sub-mode respectively, and, α _e and α _m can be affected by the shape of the nanoantenna, the dielectric constant or conductivity of the constituent materials. ε _s represents the dielectric constant of the material around the nano-antenna, and μ _s represents the magnetic permeability of the material around the nano-antenna.

The Kerker conditions of nanoantennas can be divided into the first Kerker condition and the second Kerker condition. Wherein, the first Kerker condition refers to that, under certain permittivity and magnetic permeability conditions, using electric dipoles and magnetic dipoles with the same intensity and phase to eliminate the backpropagating scattered field. The second Kerker condition refers to the use of electric dipoles and magnetic dipoles with the same strength and opposite phases to eliminate the forward-propagating scattered field under certain permittivity and magnetic permeability conditions.

In principle, nanoantennas can also provide higher-order pole modes, such as electric quadrupole mode and magnetic quadrupole mode, so the Kerker condition can also be generalized as "generalized Kerker condition". For example, the generalized first Kerker condition and the generalized second Kerker condition, in the generalized first Kerker condition and the generalized second Kerker condition, the light propagation in the high-order pole mode has better directionality, that is, the forward scattered beam or Backscattered beams. Further, the directivity of light propagation in the quadrupole mode is better than that in the dipole mode, and the good directivity of the light propagation can be understood as: the main lobe of the scattered beam in the quadrupole mode is larger than that of the dipole The main lobe of the scattered beam is narrower in the pole mode. In general, the forward scattering angle range of the high-order pole modes is smaller than that of the low-order pole modes. For example, when the Kerker condition is satisfied, the forward scattering angle range of the hexapole mode is smaller than that of the quadrupole mode, and the forward scattering angle range of the quadrupole mode is smaller than that of the dipole mode scope. When multiple similar nano-antennas are arranged sequentially along the light propagation direction, such as in a straight line, the angle of forward scattering of light can be further reduced.

Among them, from the Kerker condition of the above formula (1), it can be seen that the polarization direction when the light source is irradiated, the pole modes α _e and α _m of the nano-antenna itself, and the material constitutive parameters ε _s and μ _s around the nano-antenna , jointly determine whether the Kerker condition can be established. That is to say, the Kerker condition can be affected by adjusting the constitutive parameters of the materials around the nano-antenna under the condition that the pole mode of the nano-antenna itself remains unchanged.

It should be understood that the above scheme only describes the different ranges of forward scattering angles brought about by a certain type (quadrupole mode or hexapole mode). In addition, there will be some other situations in the nanoantenna, as shown in Figure 2. There are electrodes of different orders, magnetic poles of different orders, or combinations of multiple electrodes of different orders and magnetic poles of different orders at the same time. These combinations can change the forward scattering angle range of the nano-antenna. Form different viewing angle ranges.

Generally speaking, when the Kerker condition is not satisfied, the nanoantenna can produce ordinary large-angle scattering; when the Kerker condition is satisfied, the nanoantenna can produce forward small-angle scattering. When the Kerker condition is met, observers outside the coverage of small-angle scattering cannot receive light, or can only receive very weak light, and only observers within the coverage of small-angle scattering can see the display.

The application scenario and system architecture of the technical solution of the present application are introduced below.

The present application is applicable to a display device comprising an electronic display screen. For example, as shown in Figure 3, the display device may be a terminal device, and further, the terminal device may be a smart terminal, a mobile phone, a notebook computer (laptop), a tablet computer (pad), a personal computer (personal computer, PC) ), personal digital assistant (PDA), foldable terminal, wearable device with wireless communication function (such as smart watch or bracelet), user device (user device) or user equipment (UE), Smart home devices, such as smart screens (Vision), vehicle-mounted computers, game consoles, and augmented reality (augmented reality, AR)\virtual reality (virtual reality, VR) devices, etc., the embodiments of the present application are specific to the specific device form of the terminal device No limit. In addition, the above-mentioned various terminal devices include but are not limited to running Apple (IOS), Android (Android), Microsoft (Microsoft) or other operating systems.

Referring to FIG. 4 , it is a schematic structural diagram of a display device provided by the present application. The display device 10 includes at least one controller 20 , a circuit board 30 and a display device 40 . Wherein, at least one controller 20 is used to provide power for the circuit board 30 , and the circuit board 30 is connected with the display device 40 . Wherein, the display device 40 includes at least one display unit, and the display unit may include: a pixel light emission control circuit, a nano-antenna control circuit, a light-emitting pixel, a nano-antenna structure, and the like. And a pixel array can be composed of a plurality of light-emitting pixels, a nano-antenna structure and a control circuit. The circuit board 30 is connected with elements such as at least one light-emitting pixel, a nano-antenna structure, and a control circuit, and controls these elements through electrical signals.

There are nano-antenna structures on at least part or all of the pixel units of the display device 40 . The at least part or all of the pixel units can emit light of a specific color (ie, a specific wavelength). Whether each pixel unit emits light and the intensity of the light is controlled by the pixel light emission control circuit. The nano-antenna structure affects the scattering angle range of light emitted by the pixel unit, for example, one is to form an angle range with wide scattering, and the other is to form an angle range with narrow scattering. Wherein, the wide scattering angle range corresponds to a normal display mode of the display device, and the narrow scattering angle range corresponds to a peep-proof display mode of the display device.

The embodiment of the present application mainly integrates a nano-antenna structure on the light-emitting pixels of the display device, so that the display device can display both a wide-scattering viewing angle range and a narrow-scattering viewing angle range. When the display device displays a narrowly scattered viewing angle range, that is, it is in the anti-peeping display mode, it has an anti-peeping function. Wherein, the display devices to which the display device can be applied include but are not limited to, light-emitting diodes (light-emitting diode, LED), organic light-emitting diodes (Organic LED, OLED) and the like. Therefore, in the following embodiments, the polarization direction of the light source and the nano-antenna structure in the light-emitting pixel are mainly described.

This embodiment provides a display device, which may be the aforementioned display device 40 shown in FIG. 4 , and the display device 40 includes at least one display unit.

Referring to FIG. 5 is a schematic structural diagram of a display unit provided in this embodiment, the display unit includes: a first control circuit 41 , a second control circuit 42 , a first light-emitting pixel 43 , a polarization layer 44 and a nano-antenna structure 45 .

In addition, optionally, the display unit further includes transparent media 47a and 47b, transparent electrodes 46a and 46b, reflective bottom plate 48 and other structural components.

Among them, a structural relationship is that the connection relationship of each component in the order from bottom to top is: reflective base plate 48, first control circuit 41, first light-emitting pixel 43, transparent electrode 46b, polarizing layer 44, transparent electrode 46a, transparent medium 47b nano antenna structure 45 and transparent medium 47a.

Specifically, the first control circuit 41 is located between the reflective base plate 48 and the first light-emitting pixels 43 , and the first control circuit 41 is used to control the first light-emitting pixels 43 to emit light beams, such as first light beams, to the polarization layer 44 .

Optionally, the first control circuit 41 may be the aforementioned pixel light emission control circuit in FIG. 4 .

The polarization layer 44 covers the first light-emitting pixel 43 , and the nano-antenna structure 45 covers the polarization layer 44 .

The nanoantenna structure 45 may include at least one nanoantenna, and the structure of the at least one nanoantenna may be a geometric nanoantenna structure. For example, as shown in FIG. 6, the geometric nanoantenna structure may be any geometric structure. Examples include, but are not limited to, cubic nanoantennas, cylindrical nanoantennas, spherical nanoantennas, or composite nanoantennas formed by combinations of the foregoing nanoantennas.

Further, the composite nanoantenna includes, but is not limited to, a combination of one or more cubic nanoantennas and cylindrical nanoantennas. A possible composite nano-antenna is shown in Figure 6. The composite nano-antenna is composed of a cube and a cuboid.

Optionally, the nano-antenna structure 45 further includes an adjustable material and/or a transparent medium. As shown in FIG. 7A , the nanoantenna structure 45 includes a transparent medium 47c covering at least one nanoantenna. In addition, optionally, as shown in FIG. 7B , the nanoantenna structure 45 further includes an adjustable material, and material characteristics in the adjustable material, such as constitutive parameters in the adjustable material, can be adjusted.

The polarizing layer 44 is arranged on the light-emitting side of the first light-emitting pixel 43, and the polarizing layer 44 contains liquid crystal molecules for controlling the polarization direction of the second light beam. converted into the second light beam and then emitted.

The second control circuit 42 is connected with the polarization layer 44 or the nano-antenna structure 45, as shown in Figure 5 or Figure 8, can change the scattering angle of the third beam, the third beam is the second beam passing through The outgoing beam after the nano-antenna structure 45 .

Specifically, when the second control circuit 42 is connected to the polarization layer 44 or the nano-antenna structure 45, it is used to switch the working mode of the nano-antenna structure 45 between satisfying the Kerker condition and not satisfying the Kerker condition. When the working mode of the nano-antenna structure 45 is switched between satisfying the Kerker condition and not satisfying the Kerker condition, the scattering angle of the third light beam changes.

Firstly, an embodiment of controlling the nano-antenna structure 45 to switch between satisfying and not satisfying the Kerker condition when the second control circuit 42 is connected to the polarization layer 44 is introduced.

A structural connection relationship is that under the condition that the nano-antenna structure 45 remains unchanged, the second control circuit 42 is connected to the polarization layer 44, and the second control circuit 42 is used to apply a voltage to the polarization layer 44 to change the By changing the polarization direction of the second light beam, the scattering angle of the third light beam emitted through the nano-antenna structure 45 is changed.

Wherein, the condition that the nano-antenna structure 45 remains unchanged includes: the pole mode of the nano-antenna itself and the material around the nano-antenna are invariable, that is, the nano-antenna structure in the nano-antenna structure 45 is fixed, and the material around the nano-antenna is invariable. The material properties are unchanged.

As shown in FIG. 9 , the first light-emitting pixel 43 emits light of a specific color (wavelength) under the action of the first control circuit 41 , such as a first light beam, and the first light beam is emitted to the polarization layer 44 . The second control circuit 42 is connected to the polarizing layer 44 through the transparent electrodes 46a and 46b, and is used to apply a certain voltage to the polarizing layer 44, and the liquid crystal molecules in the polarizing layer 44 change the long axis of the liquid crystal molecules under the action of a certain voltage Direction, and then can control the polarization direction of the first light beam emitted by the first light-emitting pixel 43, convert the first light beam into a second light beam, and then the second light beam is emitted from the polarization layer 44, and irradiates on the nano-antenna structure 45 superior.

Since the polarizing layer 44 contains liquid crystal molecules, the polarization direction of the second light beam can be dynamically adjusted. For example, changing the polarization direction of linearly polarized light, or changing circularly polarized light between left-handed polarization and right-handed polarization, thereby changing the scattering angle of the third light beam, which is the second The outgoing beam after the beam passes through the nano-antenna structure 45 .

Wherein, when the second control circuit 42 applies the first voltage to the polarization layer 44, the polarization direction of the second light beam can be controlled to be parallel to the side length of the bottom surface of the geometric nanoantenna through the polarization layer 44, so that the nanoantenna structure The working mode of 45 satisfies the Kerker condition, thereby changing the scattering angle of the third light beam to form a range of narrow scattering angles, which is the anti-peeping display mode at this time.

Optionally, when the working mode of the nano-antenna structure 45 satisfies the Kerker condition, the scattering angle of the third light beam is the first angle, and when the working mode of the nano-antenna structure 45 does not satisfy the Kerker condition When , the scattering angle of the third light beam is a second angle, the first angle is different from the second angle, and the first angle is smaller than the second angle.

The first voltage is a preset voltage, and the preset voltage is a preset value, or any value belonging to a preset range interval, and the first voltage can be applied or turned off under the control of the second control circuit 42. The embodiment does not limit the setting process of the first voltage.

In an example, when the geometric nanoantenna is a cubic nanoantenna, as shown in FIG. 10A, the bottom surface of the cubic nanoantenna is surrounded by a side length a and a side length b, and a>b, then the second light beam is controlled The polarization direction of is parallel to the side length a of the bottom surface of the cubic nanoantenna, that is, it is polarized along the x-axis direction. Wherein, the z-axis is the upward direction perpendicular to the bottom surface, the y-axis is perpendicular to the x-axis and the z-axis and the direction points into the paper, which conforms to the right-hand rule. The y-axis of this embodiment is in the cubic nano-antenna structure shown in FIG. 10A not shown in

Optionally, in another example, when the geometric nanoantenna is a composite nanoantenna, as shown in FIG. 10C, the composite nanoantenna structure is composed of a cube and a cuboid, and the cube structure is arranged on In the cuboid structure, the bottom surface of the composite nano-antenna is a side of the cuboid, the longer side of the side is L1, and the second control circuit 42 controls the polarization direction of the second light beam so that it is aligned with the bottom surface The direction of the side length L1 is parallel. At this time, the working mode of the nano-antenna structure 45 satisfies the Kerker condition, forming a viewing angle with a narrow scattering range.

Optionally, in yet another example, when the geometric nanoantenna is a cylindrical nanoantenna, as shown in FIG. 10E , the bottom surface of the cylindrical nanoantenna is elliptical. Suppose the center of the ellipse is 01, the major axis of the ellipse is AB, and the minor axis is CD. Wherein, the length of the major axis AB is L1, and the major axis AB is parallel to the x-axis, when the polarization direction of the second light beam is controlled to be parallel to the major axis AB of the bottom surface of the cylindrical nano-antenna, the working mode of the nano-antenna structure 45 Satisfy the Kerker condition and form a viewing angle with a narrow scattering range.

In addition, when the second control circuit 42 stops applying the first voltage to the polarization layer 44, or when the applied voltage is greater than or less than the first voltage, the first light beam becomes The second light beam, the second light beam shoots towards the nano-antenna structure 45, and the third light beam emitted after passing through the nano-antenna structure 45 does not satisfy the Kerker condition, and forms a wide range of scattering angles at this time.

Specifically, in the example where the nanoantenna structure is a cubic nanoantenna, as shown in FIG. 18B, or, in the example where the nanoantenna structure is a composite nanoantenna, as shown in FIG. 18D, the polarization layer 44 When controlling the polarization direction of the second light beam to be non-parallel to the side length a of the bottom surface, for example, the polarization direction is along the diagonal direction between the side length a and the side length b of the bottom surface. The scattering angle of the third light beam diverges outward, which does not satisfy the Kerker condition, and at this time, a wide scattering range of viewing angle is formed.

In this example, when the polarization direction of the light source is adjusted by applying a certain voltage, the polarization direction of the incident light (that is, the second light beam) is parallel to the side length of the bottom surface of the cube nano-antenna, so that the length of the light passing through the cube nano-antenna is The side length of the bottom surface of the cubic nano-antenna is equal to that of the cubic nano-antenna, and combined with the structure of the nano-antenna, it can excite the polar sub-mode satisfying the Kerker condition, resulting in a viewing angle with a narrow scattering range.

Similarly, in the example where the nano-antenna structure is a cylindrical nano-antenna, as shown in FIG. When the direction is along the short axis CD, or along other directions except the long axis AB, the scattering angle of the third light beam emitted after passing through the nano-antenna structure 45 diverges outward, which does not satisfy the Kerker condition.

It should be understood that when the bottom surface of the above-mentioned cubic nanoantenna or combined nanoantenna can be rectangular or square; the bottom surface of the cylindrical nanoantenna can be oval or circular. No restrictions.

In this embodiment, the second control circuit is set to be connected to the polarization layer. When the second control circuit applies a certain voltage to the polarization layer, the first light beam generated by the light-emitting pixel will change the polarization of the first light beam after passing through the polarization layer. Direction, the second light beam is emitted, and the polarization direction of the second light beam when passing through the nano-antenna structure is parallel to the side length of the bottom surface of the nano-antenna structure. At this time, the electric quadrupole mode and the magnetic quadrupole mode satisfying the Kerker condition are excited. , the scattering angle of the emitted third light beam is a narrow angle, and the scattering direction is forward, realizing the anti-peeping display mode, as shown in FIG. 11A , thereby effectively preventing people outside the narrow scattering angle range from peeping.

When the second control circuit does not apply a certain voltage to the polarizing layer, or when the applied voltage is not a preset voltage, the scattering angle of the third light beam emitted after passing through the polarizing layer and the nano-antenna structure diverges, and at this time, the incident light (that is, the first The polarization direction of the first light beam) and the nano-antenna structure cannot excite the pole sub-mode satisfying the Kerker condition, the scattering angle of the outgoing light (that is, the third light beam) is a wide angle, and the scattering direction is forward, as shown in Figure 11B, which can realize Normal display mode.

Optionally, in another embodiment, keeping the incident light and the polarization direction of the first light beam unchanged, the scattering angle of the third light beam emitted from the nano-antenna structure is changed by adjusting the nano-antenna structure, so that the nano-antenna The working mode of the structure is switched between satisfying and not satisfying the Kerker condition.

Specifically, the structural connection relationship, as shown in FIG. 8 , the second control circuit 42 is connected to the nano-antenna structure 45 for changing the scattering angle of the third light beam.

Wherein, the nano-antenna structure 42 includes an adjustable material, and the characteristics of the adjustable material can be changed. When the second control circuit 42 controls the characteristic of the adjustable material to change, the scattering angle of the third light beam is also corresponding changed.

Referring to FIG. 12A , it is a cross-sectional view of a nano-antenna structure containing tunable materials. Among them, the nano-antenna is divided into two parts, one part is a nano-antenna containing adjustable materials, as shown in the gray area in Figure 12A; the other part is just a nano-antenna, as shown in the white area in Figure 12A. Among them, both nanoantennas and tunable materials are included in the gray area. In addition, the tunable material is also called nano-antenna surrounding material.

In addition, the two components of the aforementioned nano-antenna, the gray area and the white area, may also have other structures. For example, as shown in FIG. 12B , nanoantennas (gray areas) containing tunable materials are placed side by side with nanoantennas (white areas). Alternatively, as shown in Figure 12C, the nanoantenna (gray area) containing the tunable material wraps the nanoantenna (white area), wherein both the nanoantenna and the nanoantenna containing the tunable material are spherical or cylindrical structures . In this embodiment, there is no limitation on the structure and connection position relationship of the two components of the nano-antenna.

Among the two components of the nano-antenna, the structure of the nano-antenna can be any geometrical nano-antenna in the foregoing embodiments, such as a cubic nano-antenna, a cylindrical nano-antenna or a combined nano-antenna.

Optionally, the nano-antenna structure 45 further includes a transparent medium 47c located between the transparent electrodes 46a and 46b, as shown in FIG. 13 , for fixing the nano-antenna structure.

In any of the aforementioned nanoantenna structures 45 in FIGS. 12A to 12C , the constitutive parameters of the tunable material of the nanoantenna containing the tunable material are tunable. The constitutive parameter is a variable parameter in the adjustable material, which is used to describe the properties of the adjustable material. When the second control circuit 42 applies a voltage to the tunable material, the constitutive parameters of the tunable material can be changed, thereby changing the state of the tunable material.

Wherein, the constitutive parameters include permittivity, magnetic permeability, electrical conductivity and the like. The adjustable material includes but not limited to germanium antimony tellurium, vanadium oxide, antimony telluride, bismuth ferrite and other materials.

For example, when the tunable material is a germanium antimony tellurium material, the germanium antimony tellurium material is a chalcogenide ternary alloy. The three most commonly used stoichiometric ratios for this ternary alloy are Ge1Sb4Te7, Ge1Sb2Te4, and Ge2Sb2Te5. Among them, germanium antimony tellurium material can be converted between crystalline state and amorphous state under certain voltage control. Specifically, under the voltage applied by the second control circuit, the specific gravity of antimony metal content and germanium metal content is changed. With the increase of antimony content, the crystallization speed is accelerated and the crystallization temperature is reduced; and with the increase of germanium content, the crystallization time increases, and the crystallization The temperature also rises.

When the GeSbTe material changes between crystalline and amorphous states, the dielectric constant changes significantly, which leads to changes in α _e and α _m in the nanoantenna structure. Among them, α _e represents the electrical composite scalar polarizability of the nanoantenna itself, α _m represents the magnetic composite scalar polarizability, and the polarization modes corresponding to α _e and α _m are the electrode sub-mode and the magnetic pole sub-mode, respectively. When designing nano-antennas, the nano-antenna structures containing tunable materials can be designed according to the crystalline permittivity to meet the Kerker conditions, which can form a viewing angle with a narrow scattering range.

When the voltage applied by the second control circuit to the GST material changes the dielectric constant and changes the GST material from a crystalline state to an amorphous state, the polar mode satisfying the Kerker condition cannot be excited, thus forming an ordinary wide The viewing angle of the scatter range.

For another example, when the adjustable material is a vanadium oxide material, when the second control circuit 42 applies a voltage to the vanadium oxide material, the electrical conductivity in the vanadium oxide material can be changed, so that the state of the vanadium oxide phase change material is in the medium state and metal state, when the vanadium oxide material is in the medium state, it can excite the polar mode satisfying the Kerker condition, change the scattering angle of the third light beam, and emit a forward beam with a narrow scattering angle beam. When the vanadium oxide material changes from a dielectric state to a metallic state, the scattering angle of the third light beam is changed to emit a light beam with a wide scattering angle, and the Kerker condition is not satisfied at this time.

For another example, when the adjustable material includes germanium antimony tellurium material and vanadium oxide material, the second control circuit 42 is applied to the adjustable material, and simultaneously changes the dielectric constant in the germanium antimony tellurium material and the vanadium oxide material. The electrical conductivity in the material makes the germanium antimony tellurium material in the crystalline state and the vanadium oxide material in the dielectric state.

In another possible implementation, the adjustable material is a liquid crystal material. As shown in FIG. 12D, the liquid crystal material includes liquid crystal molecules. For the convenience of description, it is assumed in this embodiment that the structure of the liquid crystal molecules is an ellipsoid or an ellipsoid, and the liquid crystal molecules are filled in a transparent medium 47c, which is understood as the The transparent medium 47c contains liquid crystal material. Wherein, the long-axis direction of at least part or all of the liquid crystal molecules can be adjusted by controlling the voltage applied by the circuit. At this point, the nanoantenna is a pure dielectric, which does not contain tunable materials.

In yet another possible implementation, the adjustable material includes not only liquid crystal material, but also materials such as germanium antimony tellurium and vanadium oxide, as shown in FIG. 12E . Combining Figure 12A and Figure 12D results in a tunable material that contains two tunable properties. One is to adjust the constitutive parameters of the adjustable material in the gray area in Figure 12E; the other is to adjust the long axis direction of the liquid crystal molecules in Figure 12E, so that the two parts can be adjusted under the action of a certain voltage, and the excitation satisfies The Kerker conditions for the pole mode of the nanoantenna structure.

The following describes the switching process of the various nanoantenna structures containing tunable materials that are excited by applying a certain voltage between satisfying and not satisfying the Kerker condition.

As shown in FIG. 13 , it is a schematic diagram of a display device including the nano-antenna structure of the tunable material shown in FIG. 12A . Wherein, the second control circuit 42 is connected to the nano-antenna structure 45 through the transparent electrodes 46a and 46b.

The first light-emitting pixel 43 emits a first light beam to the polarization layer 44 under the action of the first control circuit 41, and the first light beam becomes a second light beam after passing through the polarization layer 44, and the first light beam passes through the polarization layer The polarization direction does not change in the 44 process, and when the second light beam shoots to the nano-antenna structure 45, it passes through the nano-antenna (white area) and the nano-antenna (gray area) containing the adjustable material successively, and the second control circuit 42 is The nano-antenna structure 45 applies a certain voltage to adjust the constitutive parameters in the adjustable material, such as changing the dielectric constant in the germanium antimony tellurium material, so that the adjustable material changes from an amorphous state to a crystalline state, and the germanium antimony tellurium When the material has a specific dielectric constant, the working mode of the nano-antenna structure 45 can be excited to meet the Kerker condition, and a third light beam is emitted outward. The scattering angle of the third light beam is in a narrow angle range, and the scattering direction is forward direction.

When the second control circuit 42 changes the dielectric constant of the GST material so that the GST material changes from a crystalline state to an amorphous state, the second light beam passes through the nano-antenna structure 45 and emits the first For the three beams, the Kerker condition is not satisfied at this time, the scattering angle of the third beam is in a wide angle range, and the scattering direction is in the forward direction.

Similarly, for the nano-antenna structure shown in FIG. 12B or FIG. 12C, the second control circuit 42 changes the constitutive parameters of the adjustable material in the nano-antenna structure 45 by applying a voltage to the nano-antenna structure 45, thereby The specific process of changing the scattering angle of the third light beam to generate a forward light beam with a narrow scattering angle is the same as the above-mentioned embodiment shown in FIG. 13 , and will not be repeated here.

In this embodiment, part of the metal is set in the nano-antenna structure, that is, the adjustable material is a germanium-antimony-tellurium material or a vanadium oxide material, so that the constitutive parameters of the materials around the nano-antenna can be adjusted to change the first The beneficial effect of the scattering angle of the three beams.

Further, in this embodiment, the polarization direction of the light beam in the polarization layer is kept unchanged, a nano-antenna structure containing adjustable materials is set, and a certain voltage is applied through the control circuit to change the constitutive parameters in the nano-material, so that The state of the tunable material changes, such as from amorphous state to crystalline state, or from metallic state to dielectric state, so that the outgoing light beam (that is, the third light beam) after passing through the nano-antenna structure forms a forward wave with a narrow scattering angle. Direct the light beam for a privacy-proof display.

In another implementation, as shown in FIG. 14, the nano-antenna structure 45 is the structure shown in FIG. 12D, the adjustable material is a liquid crystal material, the liquid crystal material includes liquid crystal molecules, and the liquid crystal molecules are filled in In the transparent medium 47c. The specific adjustment process includes:

When the first light beam passes through the polarizing layer 44 to generate a second light beam, the polarization direction of the second light beam in the polarizing layer 44 does not change, and when the second light beam shoots to the nano-antenna structure 45, the second control circuit 42. A certain voltage is applied to the nano-antenna structure 45 through the transparent electrodes 46a and 46b, and the direction of the long axis of the liquid crystal molecules in the nano-antenna structure 45 will change under the action of the voltage. As shown in FIG. 15A , before the voltage is applied by the second control circuit 42 , the long axis direction of the liquid crystal molecules in the liquid crystal material is freely distributed, for example, the long axis direction is perpendicular to the bottom surface of the nano-antenna. Wherein, the bottom surface of the nano-antenna is parallel to the transparent electrode 46b, and the bottom surface of the nano-antenna is not shown in FIG. larger.

When the second control circuit 42 applies a certain voltage, the direction of the long axis of the liquid crystal molecules in the liquid crystal material changes to a direction parallel to the bottom surface of the nano-antenna, as shown in FIG. 15B , when the applied voltage reaches a predetermined When setting a value, the long-axis direction of most or all liquid crystal molecules is parallel to the bottom surface of the nano-antenna. At this time, the second light beam passing through the nano-antenna structure 45 is changed, and the third light beam is emitted outward. The three beams form a forward beam with a narrow scattering angle, and the working mode of the nano-antenna structure satisfies the Kerker condition.

It should be understood that in FIG. 15B , only one light beam passes through the polarizing layer 44 and is directed toward the nano-antenna structure 45. The direction of the long axis of the liquid crystal molecules may also include two or more light beams. 45. The long axis directions of the liquid crystal molecules are also parallel to the bottom surface of the nano-antenna.

In this embodiment, the liquid crystal material is included in the nano-antenna structure, so that the liquid crystal molecules in the liquid crystal material can change the direction of the long axis of the liquid crystal molecules under the action of applying a certain voltage, so that most or all of the long axis directions of the liquid crystal molecules are aligned with the direction of the nano-antenna. The bottom surfaces of the nano-antennas are parallel to each other, so that the pole mode of the nano-antenna structure satisfying the Kerker condition can be excited, so that the third beam emitted outward is a forward beam with a narrow scattering angle, thereby achieving the anti-peeping effect.

In yet another implementation, as shown in FIG. 16, the nano-antenna structure 45 can also be the structure shown in FIG. and other materials.

Under the nano-antenna structure shown in Figure 16, by adjusting the matching degree of the two adjustable materials, the pole mode of the nano-antenna structure meets the Kerker condition, and the switching between the normal display mode and the anti-peeping display mode is realized, in which the light beam is in The direction of propagation in the nanoantenna structure 45 is similar to that shown in FIGS. 13 and 14 previously described.

Specifically, the second control circuit 42 applies a certain voltage to the nano-antenna structure 45 through the transparent electrodes 46a and 46b. Under the action of this voltage, on the one hand, the germanium-antimony-tellurium content of the nano-antenna (gray area) containing adjustable materials is changed. The constitutive parameters of the material or vanadium oxide material, such as dielectric constant, electrical conductivity, etc., make the state of the adjustable material be a crystalline state or a dielectric state; on the other hand, change the long axis direction of the liquid crystal molecules in the transparent medium 47c, so that most Or the long axis direction of all liquid crystal molecules is parallel to the bottom surface direction of the nano-antenna, satisfying the Kerker condition, so that the scattering angle of the third light beam is a narrow angle, and the scattering direction is a forward direction. For the specific adjustment process, refer to the descriptions of the above-mentioned FIG. 13 and FIG. 14 , which will not be repeated here.

In this embodiment, the set nano-antenna structure contains two parts of adjustable materials, including metal adjustable materials, such as germanium antimony tellurium, vanadium oxide materials, and liquid crystal materials, so that it can be adjusted at multiple angles, further improving It improves the design flexibility and can better match the usage in real-world scenarios.

In addition, this embodiment provides a joint adjustment method for multiple pixel arrays of different anti-peeping display screens, and the method can be applied to any of the aforementioned display devices.

The nano-antenna structure in the display device has the characteristics of light wave regulation, and one of the main characteristics is that it can radiate electromagnetic wave energy concentratedly to a certain designated direction, which can be understood as directivity. In the foregoing embodiments, it is given that the light beam emitted by a single light-emitting pixel (such as the first light-emitting pixel 43) passes through the polarization layer or the nano-antenna structure, and the polarization direction of the incident light or the material properties in the nano-antenna structure change, thereby changing The scattering angle range of the outgoing third light beam enables the working mode of the nano-antenna structure to be switched between satisfying the Kerker condition and not satisfying the Kerker condition.

Theoretically, when there are multiple light-emitting pixels and multiple nano-antenna structures, by applying voltage through the control circuit, multiple outgoing beams can be adjusted and obtained to form scattering ranges at different angles. On the basis of this, a description is given for the joint controllability of a plurality of light-emitting pixels, so that the display device can realize various anti-peeping angle adjustment schemes.

With reference to the structure of the display device in FIG. 4 , this embodiment mainly introduces the functions of the controller 20 , and the anti-peeping display function of the display device in different scenarios can be realized through the adjustment function of the controller 20 .

In an indoor application scene, as shown in FIG. 17 , the scene includes a display device, the display device is the device shown in FIG. 4 , including a controller 20 and a display device 40, and the controller 20 passes through the 30 is connected to the display 40, and the display device 40 is the display device described in any one of the foregoing embodiments.

In addition, the scene also includes users viewing the display device. In this embodiment, it is assumed that there are 3 users viewing the display device, and the 3 users are A, B and C respectively. Wherein, the target user is a user who actually needs to be presented by the display device, and the target user thinks that other users are users who need anti-peeping. In this example, it is assumed that user B is the target user, and users A and C are users to be protected from peeping.

In order to realize anti-peeping display for users other than the target user, this embodiment provides a method for adjusting a display device, as shown in FIG. 18 , the method includes:

101: Acquire a first instruction of a first target user, where the first instruction is used to instruct a display device to start an anti-peeping display mode.

The first instruction may be manually triggered by the first target user, or the display device may be configured in an anti-peeping display mode by default when it is started. For example, one manner is that user B triggers the first instruction by means of a remote control, a touch screen, or a keyboard shortcut. Or, another way is to start the default configuration function to trigger the first instruction when the camera locates the first target user. After acquiring the first instruction, the controller of the display device starts the anti-peeping display mode of the display device.

Optionally, the triggering manner may be realized by displaying a user interface (User Interface, UI) of the device, issuing a voice command, etc., which is not limited in this embodiment.

102: Send a second instruction to the display device, the second instruction instructs the second control circuit of the display device to apply a voltage to the polarization layer or the nano-antenna structure, and change the viewing angle of the display device to the first A viewing angle.

The first viewing angle is a narrow scattering angle formed when the working mode of the nano-antenna structure of the display device satisfies the Kerker condition, and the scattering direction is a forward beam.

Wherein, the first viewing angle is determined based on the location of the first target user. Specifically, an implementation manner is that, when the controller obtains the first instruction sent by the first target user through the remote control, determine the position of the first target user according to the position of the remote control. Assuming that the location of the first target user B is the same as the location of the remote controller, the controller can obtain the location of user B by locating the location of the remote controller.

In this embodiment, assuming that the location where user B triggers the first instruction is the first location, the first viewing angle is determined according to the first location.

Optionally, the display device may also determine the first position through a camera and face recognition technology. For example, the facial features of users A, B, and C are obtained through the camera, and face recognition is performed according to the facial features of each user, so as to determine the identity of each user, and then determine the location of each user, and obtain the target user. location, the location of the anti-peeping user, and the relative position between the target user and the anti-peeping user.

Optionally, if no peeping-proof objects around the first target user B are detected, for example, only user B and no users A and C, the display device may select a default viewing angle range.

Before step 102, determining the first viewing angle according to the first position includes: acquiring a line between the center of the optical axis of the display device and the first position of the first target user, and using the The angle of view formed by the connection line within the range of plus or minus 15° from the center line is the first viewing angle, and the first viewing angle is a viewing range of 30°.

Wherein, the angle range of 15° may also be other angles, such as 30° or a range of 15°-30°, which is not limited in this embodiment.

It should be noted that the range of the first viewing angle shall not exceed the display range of a narrow scattering angle formed by the working mode of the nano-antenna structure satisfying the Kerker condition.

Step 102 specifically includes: the controller generates a second instruction, and sends the second instruction to the display device, so that the display device adjusts the display range of at least one of the display units according to the second instruction, so that the light-emitting pixels generate After the first light beam passes through the polarizing layer and the nano-antenna structure, the scattering direction of the emitted third light beam is the forward direction, and the scattering angle is a narrow angle, which satisfies the Kerker condition and forms a first viewing angle, so that only in Target user B within the range of the first viewing angle can watch the display screen of the display device, while users A and C located outside the first viewing angle cannot watch the display screen, thereby achieving the beneficial effect of anti-peeping .

Furthermore, the controller controls the process of the control circuit in the display device, and reference may be made to the foregoing embodiments of the display device. This embodiment does not describe in detail the process of the controller adjusting the outgoing angle of the light beam in the display device.

The method provides a technical scheme for anti-peeping display of the target user in an indoor scene, improves the security of the target user watching the display screen, and also increases the flexibility of the scheme design.

In addition, the method of this embodiment can also track the location of the target user, and adjust the viewing angle of the display device according to the change of the location of the target user.

For example, as shown in FIG. 19, FIG. 20A and FIG. 20B, when the first target user B moves from the first location to the second location, the method further includes:

103: Obtain a second location of the first target user, where the second location is different from the first location.

The acquisition method of the second location is the same as that of the aforementioned first location, or the second location can be obtained by tracking and locating the first target user with a camera or other sensors.

Alternatively, it may also be obtained according to a signal sent by the target user at the second location, for example, when user B is at the second location, he sends a signal or instruction to the display device through a remote controller, and the signal or instruction is used to indicate the User B activates the anti-peeping display mode.

104: Send a third instruction to the display device, where the third instruction instructs to change the viewing angle of the display device from the first viewing angle to the second viewing angle. The second viewing angle is determined based on the second position of the first target user.

Specifically, the third instruction is generated by the controller and sent to the display device, and the display device controls the second control circuit to apply a voltage to the polarization layer or the nano-antenna structure according to the third instruction, thereby Changing the viewing angle from the first viewing angle to the second viewing angle.

In addition, the second viewing angle is an angular range in which the scattering angle of the light beam emitted from the display device is a narrow angle, and the scattering direction is biased towards the second position. As shown in FIG. 20B , the scattering direction of the light beam emitted by the display device is to the right, towards the second position where user B is located, so that user B can see the display screen on the display device.

Specifically, the process of determining the second viewing angle is the same as that of the first viewing angle, for example, the line between the second position where user B is located and the center of the optical axis of the display device is The centerline, the angle of view formed within the range of plus or minus 15° based on the centerline is the second viewing angle.

The method realizes the flexible adjustment of the viewing angle of the display device based on the nano-antenna structure, and improves user experience.

Optionally, the above display device can also be applied to other application scenarios, as shown in Figure 21, the display device includes a large-screen display device, the display device includes at least one display unit, and different screens can be displayed on different display units, and at the same time Satisfy the viewing needs of two or more target users, and the content watched by different target users does not affect each other.

Among them, the display device including the large screen can be a terminal device, such as a vehicle terminal, as shown in Figure 21, the large screen display device is a tablet computer, a vehicle display screen, etc. Different video screens, and the content of the screen watched by the main driver and the co-pilot does not affect each other, that is, mutual anti-peeping display.

It should be understood that the large-screen display device proposed in this embodiment may also be a small-screen device, such as a mobile phone.

Wherein, as shown in FIG. 22, the display device includes two or more display units, and the structure of each of the display units is the same as that in the aforementioned FIG. 5, FIG. 8, FIG. 9, FIG. 13, FIG. 14 and FIG. Any one of the structures is the same. Referring to FIG. 22 , a display device including two display units is used as an example. The two display units are respectively a first display unit and a second display unit, and the first display unit and the second display unit are different.

The first display unit includes light-emitting pixels 1, control circuits, nano-antennas 1 and nano-antennas 2, etc., and the second display unit includes light-emitting pixels 2, control circuits, nano-antennas 6, and nano-antennas 7. Wherein, the light-emitting pixel 1 and the light-emitting pixel 2 are two different light-emitting pixel units that can emit different light beams, and the phase adjustment ranges of the light-emitting pixel 1 and the light-emitting pixel 2 are both 0° to 360°.

Wherein, when the phase of the light-emitting pixel 1 can be adjusted from 0° to 360°, the phase of the light-emitting pixel 2 needs to be adjusted from 360° to 0°, so that the phases of the two light-emitting pixels match. Other more specific antenna structures are the same as those of the aforementioned embodiments of the display device, and will not be repeated here.

Assuming that in the foregoing steps 101 to 102, the display unit with the first viewing angle is the first display unit, then as shown in FIG. 23, in the foregoing step 102, the viewing angle of the display device is changed to the first viewing angle. viewing angles, including:

1021: Change the viewing angle of the first display unit of the display device to the first viewing angle. And, changing the viewing angle of the second display unit of the display device to the third viewing angle. The first viewing angle is determined based on the location of the first target user, and the third viewing angle is determined based on the location of the second target user.

For example, the first target user is the main driver, the second target user is the co-pilot, the content of the display screen corresponding to the first viewing angle presents the content of the main driving perspective, and the content of the display screen corresponding to the third viewing angle The content of the display screen is presented from the perspective of the co-pilot. For example, the main driver needs to watch navigation and map content, and the user in the co-pilot position needs to watch movies or browse web pages, then the screen content displayed by the first display unit is navigation and map content, and the screen displayed by the second display unit is movie or web page Content, apply different voltages to the first display unit and the second display unit through the control circuit, so that the light beams in the two display units produce different viewing angles under the action of the adjustable material properties in the polarization layer and the nano-antenna structure range, so as to meet the needs of the display screen to display different display images when different users share a display device, and at the same time realize the anti-peep display between different users, and the display content is isolated from each other, that is, the main driver can only watch the first viewing angle The displayed picture cannot be viewed at the display picture at the third viewing angle; similarly, the co-pilot can only watch the picture displayed at the third viewing angle, and cannot watch the display at the first viewing angle. picture.

In addition, if you choose a display device with a large screen, since the number of pixels on the large screen is large, you can present clearer picture quality to the user and improve the clarity of the display.

Specifically, the process of the second display unit acquiring and presenting the third viewing angle is the same as the foregoing step 102, and reference may be made to the descriptions in the foregoing embodiments, which will not be described in detail here.

Optionally, in the foregoing step 101, the first instruction may also include user information that needs to be displayed for anti-peeping, such as the number of people for anti-peeping display, the location of the anti-peeping display, and the like.

The number and/or location of the anti-peeping display can be set by the target user, or according to the default configuration of the current scene controller. For example, for the vehicle-mounted field and the automatic driving field, the main driving position (position 1 shown in FIG. 21 ) and the co-pilot position (position 2 shown in FIG. 21 ) are the default visual display positions. Other positions, such as the position of the rear seats are anti-peeping display positions, and personnel other than the main driver and co-pilot are anti-peeping display personnel.

This embodiment provides an adjustment method of a display device, based on the same display unit, a narrow range of viewing angles can be realized, so as to achieve a display effect that is anti-peeping for the target user.

At the same time, when the position of the target user changes, the position of the target user can also be tracked, and the viewing angle of the display device can be adaptively adjusted according to the moving position of the target user, so as to achieve the beneficial effect of adjusting the display screen to follow the position of the target user and improve User experience.

In addition, this method can also adjust different display units of the display device to display different pictures, and support the needs of multiple users on the same display screen to watch different pictures, and different display units display different viewing angles under the action of different voltages. , so as to achieve the beneficial effect that the content of the screen watched by multiple users does not interfere with each other and prevent each other from peeping.

The following introduces device embodiments corresponding to the foregoing method embodiments of the present application.

Fig. 24 is a schematic structural diagram of a controller provided by an embodiment of the present application. The controller is used to implement the method for adjusting the display device in the foregoing embodiments, wherein the controller may include: an acquisition unit 210 , a processing unit 220 , a sending unit 230 and a display unit 240 .

In addition, the controller may also include more or less units and modules such as a storage unit, and this embodiment does not limit the structure of the device.

Wherein, the obtaining unit 210 is used for the first instruction of the first target user, and the first instruction instructs the display device to start the anti-peeping display mode; the processing unit 220 is used for generating a second instruction according to the first instruction, The second instruction instructs the second control circuit of the display device to apply a voltage to the polarization layer or the nano-antenna structure; the sending unit 230 is configured to send the second instruction to the display device, so that the second control circuit of the display device The control circuit applies a voltage to the polarizing layer or the nano-antenna structure to change the viewing angle of the display device to the first viewing angle.

The first viewing angle is a narrow scattering angle formed by the working mode of the nano-antenna structure of the display device satisfying the Kerker condition, and the scattering direction is the light beam in the forward direction.

The display unit 240 is configured to present a display screen to the first target user according to the first viewing angle range.

Optionally, in some embodiments, the location of the first target user is a first location, and the first viewing angle is determined based on the first location of the first target user.

The processing unit 220 is further configured to obtain the second location of the first target user and generate a third instruction; the sending unit 230 is further configured to send the third instruction to the display device, and the third instruction Instructing to change the viewing angle of the display device from the first viewing angle to the second viewing angle; the second viewing angle is determined based on the second position of the first target user, so The second position is different from the first position, the scattering angle of the light beam at the second viewing angle is a narrow angle, and the scattering direction is toward the second position.

The display unit 240 is further configured to present the display screen to the first target user according to the second viewing angle.

Optionally, in some other embodiments, the display device includes a first display unit and a second display unit, and the processing unit 220 is further configured to display the visual information of the first display unit of the display device changing the angle to the first viewing angle; and changing the viewing angle of the second display unit of the display device to the third viewing angle.

Wherein, the first viewing angle is determined based on the location of the first target user, and the third viewing angle is determined based on the location of the second target user. The first target user may be the main driver in the vehicle, and the second target user may be the co-driver.

The display unit 240 is further configured to present the first display picture to the first target user according to the first viewing angle range, and present the second display picture to the second target user according to the third viewing angle range. The first display screen corresponds to the content displayed by the first display unit, and the second display screen corresponds to the content displayed by the second display unit.

In hardware implementation, the embodiment of the present application further provides a display device. The structure of the display device may be the same as that of the display device 10 shown in FIG. 4 . For example, as shown in FIG. 4 , the display device 10 includes at least one controller 20, a circuit board 30 and a display device 40.

Wherein, the one controller 20 is connected to the display device 40 through the circuit board 30, and the display device 40 includes at least one display unit, and the display unit is the display unit as described in any of the foregoing embodiments.

The at least one controller 20 is used to control the display device to change the scattering direction of the third light beam, execute the adjustment method of the display device in the foregoing embodiment, and realize the viewing angle of the display device at the first visible angle. Angle to third viewing angle range switching.

In addition, the at least one controller 20 may further include a memory, the memory is used to store computer program instructions, and when the controller invokes the program instructions, the method for adjusting the display device in the foregoing embodiments may be executed.

Optionally, the above display device may be a terminal device. When the display device is a terminal device, its structure is shown in FIG. 25, including at least one processor 110, memory 120, universal serial bus (universal serial bus) , USB) interface 130, communication module 140, at least one display screen 150, at least one camera 160, audio module 170, sensor module 180, button 190 and power management module 200, etc.

Wherein, at least one processor 110 may include one or more processing units, for example: the processor 110 may include an application processor (application processor, AP), a modem processor, a digital signal processor (digital signal processor, DSP) , baseband processor and/or neural network processor (neural-network processing unit, NPU), etc. Wherein, different processing units may be independent devices, or may be integrated in one or more processors, such as integrated in a system chip (system on a chip, SoC).

In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (inter-integrated circuit, I2C) interface, an integrated circuit built-in audio (inter-integrated circuit sound, I2S) interface, a pulse code modulation (pulse code modulation, PCM) interface, a universal asynchronous transmitter (universal asynchronous receiver/transmitter, UART) interface, mobile industry processor interface (mobile industry processor interface, MIPI), general-purpose input and output (general-purpose input/output, GPIO) interface, subscriber identity module (subscriber identity module, SIM) interface and / Or USB interface 130 and so on.

The at least one processor 110 may be the aforementioned at least one controller 20 shown in FIG. 4 .

The memory 120 may be used to store computer-executable program code, which includes instructions. The memory 120 may include an area for storing programs and an area for storing data. Wherein, the stored program area can store an operating system, an application program required by at least one function, and the like. The storage data area can store data created during the use of the terminal device. In addition, the memory 120 may include one or more storage units, for example, may include a volatile memory (volatile memory), such as a random access memory (dynamic access memory, RAM), and may also include a non-volatile memory (non-volatile memory). memory, NVM), such as read-only memory (read-only memory, ROM), flash memory (flash memory), etc. The at least one processor 110 executes various functional applications and methods of the terminal device by executing the program instructions stored in the memory 120 and/or the program instructions stored in the memory provided in the processor.

The communication module 140 includes: a mobile communication module, a wireless communication module, a radio frequency circuit, an antenna 1 and an antenna 2 and other components or modules, which are used to implement communication transmission between the terminal device and external devices, such as receiving the first instruction.

Further, the mobile communication module can provide solutions for applications including wireless communication such as 2G/3G/4G/5G. The mobile communication module may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA) and the like. In some embodiments, at least part of the functional modules of the mobile communication module may be set in the processor 110 . In some other embodiments, at least part of the functional modules of the mobile communication module and at least part of the modules of the processor 110 may be set in the same device.

The wireless communication module can include a wireless fidelity (wireless fidelity, WiFi) module, a bluetooth (bluetooth, BT) module, a GNSS module, a near field communication technology (near field communication, NFC) module, an infrared (infrared, IR) module Wait. The wireless communication module may be one or more devices integrating at least one of the above modules. The wireless communication module receives electromagnetic waves via the antenna 1 or the antenna 2 , frequency-modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 110 . The wireless communication module can also receive the signal to be sent from the processor 110 , frequency-modulate it, amplify it, convert it into electromagnetic wave and radiate it through the antenna 1 or antenna 2 .

In addition, the wireless communication functions of the terminal equipment include but are not limited to: global system for mobile communications (GSM), general packet radio service (general packet radio service, GPRS), code division multiple access (code division multiple access (CDMA), wideband code division multiple access (WCDMA), time-division code division multiple access (TD-SCDMA), long term evolution (LTE) , 5th generation mobile networks new radio (5G NR), BT, GNSS, WLAN, NFC, FM, and/or IR functions. GNSS can include global positioning system (global positioning system, GPS), global navigation satellite system (global navigation satellite system, GLONASS), Beidou satellite navigation system (beidou navigation satellite system, BDS), quasi-zenith satellite system (quasi-zenith) satellite system (QZSS) and/or satellite based augmentation systems (SBAS).

The display screen 150 is used to display at least one viewing angle. The display screen 150 may be the display device or display in the foregoing embodiments. The display device or display can adopt a liquid crystal display (liquid crystal display, LCD), an organic light-emitting diode (organic light-emitting diode, OLED), an active matrix organic light-emitting diode or an active matrix organic light-emitting diode (active -matrix organic light emitting diode, AMOLED), flexible light-emitting diode (flex light-emitting diode, FLED), MiniLED, MicroLED, Micro-OLED, quantum dot light emitting diodes (quantum dot light emitting diodes, QLED), etc. In some embodiments, the terminal device may include 1 or N display screens, where N>1 and is a positive integer.

The camera 160 is used to collect images of the user, such as information such as facial features of the user. The camera 160 includes a lens and a photosensitive element, and an object generates an optical image through the lens and projects it to the photosensitive element. The photosensitive element may be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. In some embodiments, the terminal device may include 1 or N cameras, where N>1 and is a positive integer.

The NPU is a neural-network (NN) computing processor, which quickly processes input information by referring to the structure of biological neural networks, such as the transmission mode between neurons in the human brain. Applications such as intelligent cognition of terminal equipment can be realized through NPU, such as: image recognition, face recognition, voice recognition, etc.

The audio module 170 is coupled to the processor 110 to implement communication between the processor 110 and the audio module 170 . In some embodiments, the audio module 170 can transmit audio signals to the communication module 140 through the I2S interface, so as to realize the function of answering calls through the Bluetooth headset. In addition, the audio module 170 and the communication module 140 may be coupled through a PCM bus interface. In some embodiments, the audio module 170 can also transmit audio signals to the communication module 140 through the PCM interface, so as to realize the function of answering calls through the Bluetooth headset. Both the I2S interface and the PCM interface can be used for audio communication.

The sensor module 180 includes a touch sensor 1801 and a pressure sensor 1802 . Wherein, the touch sensor 1801 is also called “touch device”. The touch sensor 1801 may be disposed on the display screen 150, and the touch sensor 1801 and the display screen 150 form a touch screen, also called a “touch screen”. The touch sensor 1801 is used to detect a touch operation acting on or near it. The touch sensor can pass the detected touch operation to the processor to determine the type of touch event. Visual output related to the touch operation can be provided through the display screen 150 . In other embodiments, the touch sensor 1801 may also be disposed on the surface of the terminal device, which is different from the position of the display screen 150 . The pressure sensor 1802 is used to measure the pressure value of the user's touch screen. In addition, other sensors may also be included, such as a gyroscope sensor, an acceleration sensor, a temperature sensor, and the like.

The keys 190 include a power key, a volume key and the like. The key 190 may be a mechanical key. It can also be a touch button. The terminal device can receive key input and generate signal input related to user settings and function control of the terminal device. For example, the target user inputs the first instruction through the button 190 .

The power management module 200 is used for connecting the battery and at least one processor 110 . The power management module 200 receives battery power and supplies power to at least one processor 110 , memory 120 , communication module 140 , display screen 150 , camera 160 and so on. In some other embodiments, the power management module 200 may also be disposed in the processor 110 .

It can be understood that, the structure shown in the embodiment of the present application does not constitute a specific limitation on the terminal device. In other embodiments of the present application, the terminal device may include more or fewer components than shown in the figure, or combine certain components, or separate certain components, or arrange different components. The illustrated components can be realized in hardware, software or a combination of software and hardware.

When implemented using software, it may be implemented in whole or in part in the form of a computer program product. For example, in the aforementioned device shown in FIG. 24 , the acquisition unit 210 can be realized by the communication module 140 and the antenna, the functions of the processing unit 220 and the sending unit 230 can be realized by at least one processor 110, and the display unit 240 can be realized by At least one processor 110 and a display screen 150 are implemented, and the function of the storage unit may be implemented by the memory 120 .

An embodiment of the present application further provides a computer program product, where the computer program product includes one or more computer program instructions. The computer program product may be stored in a memory, and when the computer loads and executes the computer program instructions, all or part of the processes or functions described in FIG. 18 , FIG. 20 and FIG. 23 are generated. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable devices.

The computer program instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, e.g., from a network node, computer, server or data The center transmits to another node through wired or wireless means.

In addition, in the description of the present application, unless otherwise specified, "at least one" means one or more than one. In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first", "second", and "third" are used for the same items or items with basically the same functions and effects. distinguish similar items. Those skilled in the art can understand that words such as "first", "second", and "third" do not limit the quantity and execution order.

The embodiments of the present application described above are not intended to limit the scope of protection of the present application.

Claims

A display device, characterized in that the display device includes at least one display unit, and each display unit includes: a first control circuit, a light-emitting pixel, a polarization layer, a nano-antenna structure, and a second control circuit, wherein,

The first control circuit is connected to the light-emitting pixel, and the first control circuit applies a voltage to the light-emitting pixel, so that the light-emitting pixel emits a first light beam to the polarization layer;

The polarizing layer is arranged on the light-emitting side of the light-emitting pixel, and is used to control the polarization direction of the second light beam, and the second light beam is the outgoing light beam after the first light beam passes through the polarizing layer;

The nano-antenna structure is arranged on the side of the polarizing layer away from the light-emitting pixel, and is used to control the scattering angle of the third light beam. The third light beam is formed after the second light beam passes through the nano-antenna structure. the outgoing beam;

The second control circuit is connected with the polarization layer or the nano-antenna structure, and is used to change the scattering angle of the third light beam.
The display device according to claim 1, wherein the second control circuit is connected to the polarization layer or the nano-antenna structure, and is used to change the scattering angle of the third light beam, comprising:

The second control circuit is connected to the polarization layer or the nano-antenna structure, and is used to switch the working mode of the nano-antenna structure between satisfying the Kerker condition and not satisfying the Kerker condition;

When the working mode of the nano-antenna structure satisfies the Kerker condition, the scattering angle of the third light beam is the first angle; when the working mode of the nano-antenna structure does not satisfy the Kerker condition, the third The light beam is scattered at a second angle, the first angle being different from the second angle.
The display device according to claim 1 or 2, wherein the second control circuit is connected to the polarizing layer for changing the scattering angle of the third light beam, comprising:

The second control circuit is connected to the polarization layer, and the second control circuit applies a voltage to the polarization layer to change the polarization direction of the second light beam;

When the polarization direction of the second light beam changes, the scattering angle of the third light beam changes.
The display device according to claim 3, wherein the nano-antenna structure comprises a nano-antenna, and the nano-antenna comprises at least one of the following:

Cubic nanoantennas, cylindrical nanoantennas or composite nanoantennas.
The display device according to claim 4, wherein the changing the polarization direction of the second light beam comprises:

changing the polarization direction of the second light beam so that the polarization direction of the second light beam is parallel to the side length of the bottom surface of the cubic nano-antenna or the composite nano-antenna; or,

changing the polarization direction of the second light beam so that the polarization direction of the second light beam is parallel to the long axis of the bottom surface of the cylindrical nano-antenna.
The display device according to claim 1 or 2, wherein the nano-antenna structure comprises an adjustable material;

The second control circuit is connected to the nano-antenna structure, and is used to change the scattering angle of the third light beam, including:

The second control circuit is connected to the nano-antenna structure, and the second control circuit applies a voltage to the adjustable material to change the characteristics of the adjustable material;

When the properties of the adjustable material change, the scattering angle of the third light beam changes.
The display device according to claim 6, wherein the second control circuit applies a voltage to the adjustable material to change the characteristics of the adjustable material, comprising:

The second control circuit applies a voltage to the adjustable material to change the adjustable material from an amorphous state to a crystalline state.
The display device according to claim 7, wherein the second control circuit applies a voltage to the adjustable material to change the adjustable material from an amorphous state to a crystalline state, comprising:

The second control circuit applies a voltage to the adjustable material, changes the dielectric constant of the adjustable material, and changes the adjustable material from an amorphous state to a crystalline state.
The display device according to claim 7 or 8, wherein the tunable material comprises: germanium antimony tellurium material.
The display device according to claim 6, wherein the second control circuit applies a voltage to the adjustable material to change the characteristics of the adjustable material, comprising:

The second control circuit applies a voltage to the adjustable material to change the adjustable material from a metal state to a dielectric state.
The display device according to claim 10, wherein the second control circuit applies a voltage to the adjustable material to change the adjustable material from a metal state to a dielectric state, comprising:

The second control circuit applies a voltage to the adjustable material to change the conductivity of the adjustable material, so that the adjustable material changes from a metal state to a dielectric state.
The display device according to claim 10 or 11, wherein the adjustable material comprises: vanadium oxide material.
The display device according to claim 6, wherein the adjustable material is a liquid crystal material;

The second control circuit applies a voltage to the adjustable material to change the characteristics of the adjustable material, including:

The second control circuit applies a voltage to the liquid crystal material to change the direction of the long axis of the liquid crystal molecules in the liquid crystal material to be parallel to the bottom surface of the nano-antenna.
A method for adjusting a display device, characterized in that the display device is the device according to any one of claims 1 to 13, the method comprising:

Acquiring a first instruction from a first target user, the first instruction instructing the display device to start an anti-peeping display mode;

sending a second instruction to the display device, the second instruction instructs the second control circuit of the display device to apply a voltage to the polarization layer or the nano-antenna structure, and change the viewing angle of the display device to the first possible viewing angle.
The method according to claim 14, wherein the first viewing angle is determined based on the first position of the first target user, and the method further comprises:

acquiring a second location of the first target user;

sending a third instruction to the display device, the third instruction indicating to change the viewing angle of the display device from the first viewing angle to the second viewing angle, and the second viewing angle is determined based on the second location, the second location being different from the first location.
The method according to claim 14, wherein the display device comprises a first display unit and a second display unit,

Changing the viewing angle of the display device into the first viewing angle, including:

changing the viewing angle of the first display unit of the display device to the first viewing angle, and changing the viewing angle of the second display unit of the display device to the third A viewing angle, the first viewing angle is determined based on the location of the first target user, and the third viewing angle is determined based on the location of the second target user.
A display device, characterized in that it includes a controller, a memory, and a display device,

The display device is the device according to any one of claims 1 to 13;

The memory is used to store computer program instructions;

The controller is configured to execute the computer program instructions to implement the method according to any one of claims 14-16.