CN116964515A

CN116964515A - Display device and adjusting method thereof

Info

Publication number: CN116964515A
Application number: CN202180095549.1A
Authority: CN
Inventors: 杨亮; 刘永俊; 董明杰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2023-10-27
Also published as: WO2022246698A1

Abstract

A display device (40) and a method of adjusting the display device (40). The display device (40) comprises at least one display unit (240), wherein the display unit (240) comprises a first control circuit (41), a first luminescent pixel (43), a polarizing layer (44), a second control circuit (42) and a nano-antenna structure (45). The second control circuit (42) can be connected with the polarization layer (44), and the polarization direction of the second light beam emitted from the polarization layer (44) is changed by applying a certain voltage to the polarization layer (44), so that the scattering angle of the third light beam emitted from the nano antenna structure (45) is changed; when the second control circuit (42) is connected with the nano antenna structure (45), the scattering angle of the third light beam is changed by applying a certain voltage to the nano antenna structure (45) by utilizing the material characteristic of the nano antenna structure (45), and the scattering angle of the third light beam is changed by both connecting structures, so that the third light beam is switched between a wide angle range and a narrow angle range, and the peeping prevention effect is achieved.

Description

Display device and adjusting method thereof

Technical Field

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

Background

With the popularization of various electronic devices, the use of screens to display text, pictures, video and other contents has become a major way for people to acquire information. Currently, most electronic screens are displayed in wide angle mode, as shown in FIG. 1A. This means that not only the user (main viewer) himself can see the information on the screen, but also surrounding bystanders. However, in some scenes, such as processing important documents in temporary places such as a meeting place, a waiting hall, a coffee shop, etc., or browsing personal information and viewing subscriptions in narrow environments such as subways, elevators, etc., users of electronic devices do not want surrounding irrelevant bystanders to view information on a screen, and thus electronic screens sometimes need to have a peep-proof function. Such a peeping prevention function can be generally achieved by reducing the display view angle of the electronic screen, as shown in fig. 1B.

In the industry, the simplest method for realizing the peep-proof function is to paste a peep-proof film on a screen, wherein a shading body array is arranged in the peep-proof film to shade emergent light rays with a specific angle, so that the limitation of a display view angle is realized. When using such a privacy film, there are some inconvenient factors, such as certain requirements on the film-attaching technique, and difficulty in repeated use after attachment. For this situation, a better solution is desired by the user to reduce the difficulty of use and increase the flexibility of use, even to provide more novel display functions. To meet such needs, integrated, dynamically adjustable display angle devices are becoming part of electronic screens.

Disclosure of Invention

The application provides a display device and an adjusting method of the display device, which are used for providing different display modes, and when the display modes are visible angles with narrow scattering angles, the peep-proof effect can be achieved. Specifically, the application discloses the following technical scheme:

in a first aspect, the present application provides a display device comprising at least one display unit, each of the display units comprising: the light emitting device comprises 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 with the light emitting pixel, and the first control circuit applies voltage to the light emitting pixel so that the light emitting pixel emits a first light beam to the polarization layer; the polarization layer is arranged on the light emitting side of the light emitting pixel and can be used for controlling the polarization direction of the second light beam, wherein the second light beam is an emergent light beam of the first light beam after passing through the polarization layer; the nano antenna structure is arranged on one side of the polarization layer, which is far away from the luminous pixel, and is used for controlling the scattering angle of a third light beam, wherein the third light beam is an emergent light beam of the second light beam after passing through the nano antenna structure. The second control circuit is connected with the polarization layer or the nano antenna structure and is used for changing the scattering angle of the third light beam.

The polarization layer comprises liquid crystal molecules, and the liquid crystal molecules are used for regulating and controlling the polarization of light emitted by the luminous pixels.

According to the technical scheme, under the condition that the second control circuit is connected with the polarization layer, a certain voltage is applied to the polarization layer by the second control circuit, after the first light beam generated by the luminous pixel is emitted into the polarization layer, the polarization direction of the second light beam is changed, the second light beam is emitted by the first light beam through the polarization layer, the second light beam is emitted out of the third light beam after passing through the nano antenna structure, when the scattering angle of the emitted third light beam is smaller than that before the voltage is applied, the smaller scattering angle can prevent peeping of changing the scattering range of the front part, and when the scattering angle of the third light beam is changed into a narrow angle, namely, the minimum scattering angle, the scattering direction is the forward direction, and at the moment, the display device is in a peeping prevention display mode and can effectively prevent peeping.

In addition, under the condition that the second control circuit is connected with the nano antenna structure, the second control circuit applies certain voltage to the nano antenna structure, so that the scattering angle of the third light beam emitted from the nano antenna structure is changed, the scattering angle of the third light beam is switched in different ranges, when the scattering angle of the third light beam emitted is a narrow angle, and when the scattering direction is a forward direction, the display device forms a visible angle of the narrow scattering angle, and at the moment, the display device is in an anti-peeping display mode, and peeping can be effectively prevented.

It should be noted that, before the device leaves the factory, different scattering angles are preset, and the different scattering angles correspond to different display ranges, for example, the display device is configured to be two scattering angles, namely, scattering angle 1 and scattering angle 2. Wherein the scattering angle 1 is larger than the scattering angle 2, and the display device is in a common display mode when displaying in the range of the scattering angle 1; when the display device displays in the range of the scattering angle 2, the peep-proof mode is adopted.

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 configured to change a scattering angle of the third light beam, and includes: the second control circuit is connected with the polarization layer or the nano antenna structure and is used for enabling the working mode of the nano antenna structure to be switched between meeting Ke Erke Kerker conditions and not meeting the Kerker conditions.

When the working mode of the nano antenna structure meets 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 meet 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.

When the working mode of the nano antenna structure meets Ke Erke Kerker conditions, the displayed first angle corresponds to an anti-peeping display mode; and when the Ke Erke Kerker condition is not met, displaying the second angle corresponding to the common display mode.

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 configured to change a scattering angle of the third light beam, and includes: the second control circuit is connected with the polarization layer, and applies voltage to the polarization layer to change the polarization direction of the second light beam; when the polarization direction of the second light beam is changed, the scattering angle of the third light beam is changed.

Wherein the nanoantenna structure comprises a nanoantenna comprising at least one of: a cubic nanoantenna, a cylindrical nanoantenna, or a combination nanoantenna.

With reference to the first aspect, in a further possible implementation manner of the first aspect, changing a 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 is parallel to the bottom side length of the cubic nano antenna or the combined 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.

In this implementation manner, a certain voltage is applied to the polarization layer by using the second control circuit, so that the polarization direction of the incident light (the first light beam) in the polarization layer can be changed, so that the polarization direction of the second light beam emitted from the polarization layer is parallel to the bottom side length of the cubic nano antenna or the combined nano antenna, or the polarization direction of the second light beam is parallel to the long axis of the bottom surface of the cylindrical nano antenna, thereby enabling the working mode of the nano antenna structure to meet the Kerker condition, forming a narrow scattering angle, and achieving the anti-peeping effect.

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

The second control circuit is connected with the nano antenna structure, and is used for changing the scattering angle of the third light beam, and the second control circuit comprises: the second control circuit is connected with the nano antenna structure, and applies voltage to the adjustable material to change the characteristics of the adjustable material; when the characteristics of the tunable material change, the scattering angle of the third light beam changes.

With reference to the first aspect, in a further possible implementation manner of the first aspect, the second control circuit applies a voltage to the tunable material to change a characteristic of the tunable material, including: the second control circuit applies a voltage to the tunable material to change the tunable material from an amorphous state to a crystalline state.

With reference to the first aspect, in a further possible implementation manner of the first aspect, the applying, by the second control circuit, a voltage to the tunable material to change the tunable material from an amorphous state to a crystalline state includes: the second control circuit applies a voltage to the tunable material to change the tunable material from an amorphous state to a crystalline state, changing a dielectric constant of the tunable material.

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

According to the implementation mode, the adjustable material is germanium antimony tellurium material, the state of the germanium antimony tellurium material can be switched between an amorphous state and a crystalline state by adjusting the dielectric constant in the germanium antimony tellurium material, and when the germanium antimony tellurium material is in the crystalline state, the polar mode of the nano antenna structure meeting the Kerker condition can be excited, so that the display device forms a visible angle with a narrow scattering angle.

With reference to the first aspect, in a further possible implementation manner of the first aspect, the second control circuit applies a voltage to the tunable material to change a characteristic of the tunable material, including: the second control circuit applies a voltage to the tunable material to change the tunable material from a metallic state to a dielectric state.

With reference to the first aspect, in a further possible implementation manner of the first aspect, the applying, by the second control circuit, a voltage to the tunable material to change the tunable material from a metallic state to a dielectric state includes: the second control circuit applies a voltage to the tunable material such that the tunable material changes from a metallic state to a dielectric state, changing the conductivity of the tunable material.

Wherein, optionally, the tunable material comprises: vanadium oxide material.

According to the implementation mode, the adjustable material is a vanadium oxide material, the state of the vanadium oxide material can be switched between an amorphous state and a crystalline state by adjusting the conductivity of the vanadium oxide material, and when the vanadium oxide material is in the crystalline state, the polar mode of the nano antenna structure meeting the Kerker condition can be excited, so that the display device forms a visible angle with a narrow scattering angle.

With reference to the first aspect, in a further possible implementation manner of the first aspect, the tunable material is a liquid crystal material.

The second control circuit applies a voltage to the tunable material, changing a characteristic of the tunable material, comprising: and the second control circuit applies voltage to the adjustable material to change the long axis direction of liquid crystal molecules in the liquid crystal material to be parallel to the bottom surface of the nano antenna.

According to the implementation mode, the adjustable material is a liquid crystal material, and the polar mode of the nano antenna structure meeting the Kerker condition can be excited by adjusting the long axis direction of liquid crystal molecules in the liquid crystal material, so that the display device forms a visible angle with a narrow scattering angle.

In a second aspect, the present application further provides a method for adjusting a display device, where the method is applied to a display device, and the device according to the foregoing various implementations of the first aspect, and the method includes: acquiring a first instruction of a first target user, wherein the first instruction instructs the display device to start an anti-peeping display mode; and sending a second instruction to the display device, wherein the second instruction instructs a second control circuit of the display device to apply voltage to a polarization layer or a nano antenna structure, and changes the visual angle of the display device into the first visual angle, and the first visual angle is determined based on the position of the first target user.

According to the method, according to the first visual angle, the display range of at least one display unit in the display device is adjusted, so that a first light beam generated by a luminous pixel passes through the polarization layer and then emits a second light beam, the second light beam passes through the nano antenna structure and then emits a third light beam, when the scattering angle of the emitted third light beam is a narrow angle, and the scattering direction is a forward direction, the Kerker condition is met, a visual angle of the narrow scattering angle is formed, at the moment, only a user in the visual angle range can watch the display picture of the display device, and a user outside the visual angle cannot watch the display picture, so that the anti-peeping beneficial effect is achieved.

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 visual angle is determined based on the first location of the first target user.

The method further comprises the steps of: acquiring a second position of the first target user, and sending a third instruction to the display device, wherein the third instruction instructs to change the visual angle of the display device from the first visual angle to the second visual angle; the second visual angle is determined based on a second location of the first target user, the second location being different from the first location.

According to the implementation mode, when the position of the target user changes, the position of the target user can be tracked, the visual angle of the display device is adaptively adjusted according to the moving position of the target user, and therefore the beneficial effect that the display picture follows the position adjustment of the target user is achieved, and the use experience of the user is improved.

Before leaving the factory, the display device provided by the embodiment of the application not only sets different scattering angles, such as the scattering angle 1 and the scattering angle 2, but also changes the scattering direction by applying a certain voltage through the second control circuit, so that the adjustment of the scattering direction is realized. For example, when the second control circuit applies a first voltage, such as 10V, to the polarizing layer or the nano-antenna structure, the scattering angle of the third beam is changed to be 2, and a narrow range of scattering angles is formed, and the scattering direction is the forward direction; when the first voltage is finely adjusted, for example, when 10.1V to 10.5V is applied, the scattering direction can be adjusted to be changed from the forward direction to the left direction, or when 9.9V to 9.5V is applied, the scattering direction can be changed from the forward direction to the right direction, so that the adjusted scattering direction of the third light beam faces the target user, and the effect of tracking the target user is achieved. It should be noted that, whether the adjusted scattering direction is the forward direction, the left direction or the right direction, 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 changing a viewing angle of the display device to the first viewing angle includes: changing a viewing angle of the first display unit of the display device to the first viewing angle, and changing a 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 a location of the first target user, and the third viewing angle is determined based on a location of a second target user.

The method can also adjust different display units of the display device to display different pictures, supports the requirement that the same display screen is used for viewing different pictures by multiple users, and the different display units are different in visual angle when being applied with different voltages, so that the beneficial effects of no interference of the picture contents watched by multiple users and peeping prevention are achieved.

In a third aspect, embodiments of the present application further provide a display adjustment device, where the device may be used to implement the foregoing second aspect and methods in various implementations of the second aspect.

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

In a fourth aspect, an embodiment of the present application further provides a display apparatus, where the display apparatus includes a controller and a display device, where the controller and the display device may be connected by a circuit board, and the display device is a device in the foregoing first aspect and various implementations of the first aspect.

The controller includes at least one processor or processing unit.

Specifically, the controller is configured to obtain a first instruction of a first target user, where the first instruction instructs the display device to start a peep-proof display mode; the controller is further configured to send a second instruction to the display device, where the second instruction instructs a second control circuit of the display device to apply a voltage to the polarization layer or the nano antenna structure, and change the visual angle of the display device to the first visual angle. Wherein the first visual 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 determine the first visual angle based on the first location of the first target user.

The controller is further configured to obtain a second position of the first target user, and send a third instruction to the display device, where the third instruction indicates that a visual angle of the display device is changed from the first visual angle to the second visual angle. The second visual angle is determined based on a second location of the first target user, the second location being 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 change a viewing angle of the first display unit of the display device to the first viewing angle, and change a viewing angle of the second display unit of the display device to the third viewing angle, where the third viewing angle is determined based on a position of a second target user.

In addition, the display device includes a memory coupled to the controller.

The memory is used for storing computer program instructions; the method of the foregoing second aspect and various implementations of the second aspect is implemented when the controller is configured to execute the program instructions.

Alternatively, the memory may be provided within the controller, or may be provided outside the controller.

Optionally, the display device is a terminal device.

Optionally, the terminal device includes, but is not limited to, a mobile phone, a PC, and a tablet computer.

In a fifth aspect, embodiments of the present application also provide a computer readable storage medium having instructions stored therein such that when the instructions are run on a computer or processor, they can be used to perform the method of the foregoing second aspect and various implementations of the second aspect.

In addition, the present application also provides a computer program product comprising computer instructions which, when executed by a computer or processor, implement the method of the foregoing second aspect and various implementations of the second aspect.

Drawings

FIG. 1A is a schematic diagram of a wide view angle display mode of an electronic screen according to the present application;

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

FIG. 2 is a schematic diagram showing the scattering of light beams in different polar modes according to the present application;

fig. 3 is a schematic diagram of a product form of a terminal device according to the present application;

Fig. 4 is a schematic structural diagram of a display device according to the present application;

fig. 5 is a schematic structural diagram of a display unit according to the present application;

fig. 6 is an enlarged schematic diagram of a nano antenna structure according to the present application;

fig. 7A is a schematic diagram of a nano antenna structure according to the present application;

fig. 7B is a schematic diagram of another nano-antenna structure according to the present application;

FIG. 8 is a schematic diagram of another display unit according to the present application;

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

fig. 10A is a schematic diagram of a light source polarized illumination cube nano-antenna structure according to the present application;

FIG. 10B is a schematic diagram of another polarized illumination cube nano-antenna structure with a light source according to the present application;

fig. 10C is a schematic diagram of a polarized illumination assembly nano-antenna structure of a light source according to the present application;

FIG. 10D is a schematic diagram of another polarized illumination assembly nano-antenna structure according to the present application;

fig. 10E is a schematic diagram of a cylindrical nano antenna structure irradiated by light source polarization according to the present application;

FIG. 10F is a schematic diagram of another polarized illumination cylindrical nano-antenna structure with a light source according to the present application;

FIG. 11A is a schematic view showing a narrow scattering angle display range according to the present application;

FIG. 11B is a schematic diagram showing a wide scattering angle display range according to the present application;

FIG. 12A is a schematic diagram of a nano-antenna structure comprising tunable materials according to 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 a nano-antenna structure comprising tunable materials according to the present application;

FIG. 12D is a schematic diagram of a nano-antenna structure comprising a liquid crystal material according to the present application;

FIG. 12E is a schematic diagram of a nano-antenna structure comprising a liquid crystal material and a tunable material according to the present application;

FIG. 13 is a schematic view of another light beam propagating in a display unit according to the present application;

FIG. 14 is a schematic view of another light beam propagating in a display unit according to the present application;

FIG. 15A is a schematic diagram showing the state of liquid crystal molecules in the tunable material before voltage is applied;

FIG. 15B is a schematic diagram showing the state of the liquid crystal molecules in the tunable material after voltage application according to the present application;

FIG. 16 is a schematic view of another light beam propagating in a display unit according to the present application;

FIG. 17 is a schematic view of a scene showing adjustment of the range of visibility angles according to the present application;

FIG. 18 is a flow chart of a method for adjusting a display device according to the present application;

FIG. 19 is a schematic view of another use scenario providing adjustment of the viewing angle range according to the present application;

FIG. 20A is a flowchart of another method for adjusting a display device according to the present application;

FIG. 20B is a schematic illustration of the present application providing movement of user B from a first position to a second position;

fig. 21 is a schematic view of a scene of displaying different contents on a vehicle-mounted terminal according to the present application;

FIG. 22 is a schematic diagram showing a structure of another display device according to the present application;

FIG. 23 is a flowchart of a method for adjusting a display device according to another embodiment of the present application;

FIG. 24 is a schematic diagram showing a structure of another display device according to the present application;

fig. 25 is a schematic structural view of a display device according to the present application.

Detailed Description

In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the following describes the technical solutions in the embodiments of the present application in detail with reference to the accompanying drawings.

Related art terms and backgrounds of the present embodiment are first described.

1. Parameters of the principal construct

In electromagnetic theory, the constitutive parameters refer to parameters describing the characteristics of the tunable materials, and generally mainly comprise three parameters, namely dielectric constant, magnetic permeability and electric conductivity.

2. Polar pattern

An electric dipole (electric dipole) is a system of two equal amounts of different number point charges. The electric dipole is characterized by an electric dipole moment p=ql, where l represents the distance between two point charges, and the directions of l and p are specified to be directed from-q to +q. The electric dipole is rotated under the action of the force moment in the external electric field, so that the 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 charge and negative charge systems with equal electric quantity is similar. Magnetic dipole mode: the field distribution is similar, and the electric quantity is equal to the field distribution of a forward current and reverse current loop system. Electron quadrupole mode: the simplest electron quadrupole is that 4 charges of the same charge are placed on the 4 vertices of a square, with two charge signs on each side. The electromagnetic field mode generated by the electromagnetic field is an electron quadrupole mode. Magnetic quadrupole mode: the simplest electron quadrupoles are those in which 4 currents of the same charge are placed at the 4 vertices of a square, with the two currents on each side being opposite in direction. The electromagnetic field mode generated by the magnetic field generator is a magnetic quadrupole mode.

3. Ke Erke (Kerker) condition of nanoantenna

In general, a nanoantenna is an optical structure of sub-wavelength scale capable of affecting the propagation of light. The material for manufacturing the nano antenna can be metal or medium. However, the working principle of metals is different from that of media. In metals, freely moving electrons can interact with light, affecting the propagation of light. In a medium, bound electrons tend not to move freely, but light can form displacement currents inside the medium, affecting the propagation of light.

The nano-antenna acts as a kind of scattering body, and when irradiated by a proper light source (including the irradiation direction and polarization direction of the light source), various polarization modes of the nano-antenna can be excited. These polarization modes may include electric dipole modes, magnetic dipole modes, electric quadrupole modes, magnetic quadrupole modes, even higher order electrode modes and magnetic pole modes. These polarization modes may or may not exist simultaneously. Forward unidirectional scattering can occur when both the electric polarization mode and the magnetic polarization mode exist and the Kerker condition is satisfied. This phenomenon is very unique because under other conditions, scattering tends to be multi-directional. Specifically, the broad definition of the Kerker condition is as follows:

wherein alpha is _e Represents the electrical composite scalar polarization rate of the nano antenna per se, alpha _m Representing magnetic composite scalar polarizability, alpha _e And alpha _m The corresponding polarization modes are respectively electrode sub-mode and magnetic sub-mode, and alpha _e And alpha _m Can be affected by the shape of the nanoantenna, the dielectric constant or conductivity of the constituent materials. Epsilon _s Represents the dielectric constant, mu, of the material surrounding the nano-antenna _s Indicating the permeability of the material surrounding the nano-antenna.

The Kerker conditions of the nanoantenna can be divided into a first Kerker condition and a second Kerker condition. The first Kerker condition refers to that under certain dielectric constant and magnetic permeability, the electric dipoles and the magnetic dipoles with the same strength and the same phase are utilized to eliminate the backward propagation scattering field. The second Kerker condition refers to the elimination of the forward propagating fringe field by using electric and magnetic dipoles of the same strength and opposite phase under certain permittivity and permeability conditions.

In principle, the nanoantenna may also provide higher order pole modes, such as an electronic quadrupole mode and a magnetic quadrupole mode, so the Kerker condition may also be generalized to a "generalized Kerker condition". Such as a generalized first Kerker condition and a generalized second Kerker condition in which light propagation in a higher order polar mode has better directivity, i.e., produces a forward-scattered beam or a backward-scattered beam. Further, the directivity of light propagation in the quadrupole mode is better than that in the dipole mode, and the good directivity of light propagation can be understood as: the main lobe of the scattered beam in quadrupole mode is narrower than the main lobe of the scattered beam in dipole mode. Typically, the forward scatter angle range of the higher order polar mode is smaller than the forward scatter angle range of the lower order polar mode. For example, when the Kerker condition is satisfied, the forward scatter angle range of the hexapole mode is smaller than the forward scatter angle range of the quadrupole mode, which is smaller than the forward scatter angle range of the dipole mode. When a plurality of the nano-like antennas are sequentially arranged along the light propagation direction, for example, in a straight line, the angle of forward scattering of light can be further reduced.

The Kerker condition in the above formula (1) shows that the polarization direction of the light source is the polarization direction of the nano antenna, and the polar mode alpha of the nano antenna _e And alpha _m And the intrinsic parameters epsilon of the material surrounding the nano-antenna _s Sum mu _s It is determined whether the Kerker condition is satisfied. That is, the Kerker condition can be affected by adjusting the constitutive parameters of the material surrounding the nanoantenna, i.e. in the case where the nanoantenna's own pole mode is unchanged.

It should be understood that only the forward scattering angle range caused by a certain type (quadrupole mode or hexapole mode) is described in the above scheme, and in addition, some other situations may occur in the nano antenna, as shown in fig. 2, there are electrodes with different orders, magnetic poles with different orders, or a combination of multiple electrodes with different orders and multiple magnetic poles with different orders, where the combination may change the forward scattering angle range of the nano antenna to form different visible angle ranges.

In general, nanoantennas can produce ordinary large angle scattering when the Kerker condition is not met; when the Kerker condition is met, the nanoantenna is able to produce forward small angle scattering. When Kerker condition is satisfied, observers outside the small angle scattering coverage area cannot receive light or can only receive very weak light, and only observers in the small angle scattering coverage area can see the display picture.

The application scenario and system architecture of the technical scheme of the application are described below.

The present application is applicable to a display device including an electronic display screen. For example, as shown in fig. 3, the display device may be a terminal device, further, the terminal device may be an intelligent terminal, a mobile phone, a notebook computer (laptop), a tablet computer (pad), a personal computer (personal computer, PC), a personal digital assistant (personal digital assistant, PDA), a foldable terminal, a wearable device (such as a smart watch or a bracelet) with a wireless communication function, a user device (UE), or a User Equipment (UE), an intelligent home device, such as a smart screen (Vision), a vehicle-mounted computer, a game machine, and an augmented reality (augmented reality, AR) \virtual reality (VR) device, and the embodiment of the present application does not limit the specific device configuration of the terminal device. In addition, the above-mentioned various terminal devices include, but are not limited to, apple-mounted (IOS), android (Android), microsoft (Microsoft), or other operating systems.

Fig. 4 is a schematic structural diagram of a display device according to the present application. The display apparatus 10 includes at least one controller 20, a circuit board 30, and a display device 40. Wherein, at least one controller 20 is used for providing power for a circuit board 30, and the circuit board 30 is connected with a display device 40. Wherein the display device 40 includes at least one display unit, which may include: pixel luminescence control circuit, nanometer antenna control circuit, luminescence pixel, nanometer antenna structure etc.. And a pixel array may be composed of a plurality of light emitting pixels, a nano-antenna structure, and a control circuit. The circuit board 30 connects at least one light emitting pixel, a nano-antenna structure, a control circuit, and the like, and controls these elements by an electrical signal.

The nano-antenna structure is provided on at least part or all of the pixel cells of the display device 40. The at least some or all of the pixel elements are capable of emitting light of a specific color, i.e. a specific wavelength. Whether each pixel unit emits light or not and the intensity of the emitted light are controlled by a pixel light emission control circuit. The nano-antenna structure affects the scattering angle range of the light emitted from 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 angular range corresponds to a normal display mode of the display device and the narrow scattering angular range corresponds to a peep-proof display mode of the display device.

The embodiment of the application mainly integrates a nano antenna structure on the luminous pixel of the display device, so that the display device can display a wide scattering visual angle range and a narrow scattering visual angle range. When the display device displays a narrow scattering visible angle range, namely in a peep-proof display mode, the display device has a peep-proof function. Among them, the display device may be applied to a display apparatus including, but not limited to, a light-emitting diode (LED), an Organic LED (OLED), and the like. Therefore, in the following embodiments, the polarization direction of the light source in the light emitting pixel and the nano-antenna structure will be mainly described.

The present embodiment provides a display device, which may be the display device 40 shown in fig. 4 described above, and the display device 40 includes at least one display unit.

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

In addition, the display unit may optionally further include transparent media 47a and 47b, transparent electrodes 46a and 46b, reflective backplane 48, and other structural components.

Wherein, the connection relation of each component is as follows in order from bottom to top: the reflective backplane 48, the first control circuitry 41, the first light emitting pixel 43, the transparent electrode 46b, the polarizing layer 44, the transparent electrode 46a, the transparent medium 47b nano-antenna structure 45 and the transparent medium 47a.

Specifically, the first control circuit 41 is located between the reflective backplane 48 and the first light emitting pixel 43, and the first control circuit 41 is configured to control the first light emitting pixel 43 to emit a light beam, such as a first light beam, toward the polarizing layer 44.

Alternatively, the first control circuit 41 may be the pixel light emission control circuit in fig. 4 described above.

A polarizing layer 44 overlies the first light-emitting pixels 43 and nano-antenna structures 45 overlie the polarizing layer 44.

The nano-antenna structure 45 may include at least one nano-antenna therein, and the structure of the at least one nano-antenna may be a geometric nano-antenna structure. For example, as shown in fig. 6, the geometric nano-antenna structure may be any geometric structure. Such as, but not limited to, a cubic nanoantenna, a cylindrical nanoantenna, a spherical nanoantenna, or a combination of the various nanoantennas described above.

Further, the combination nanoantenna includes, but is not limited to, a combination of one or more cubic nanoantennas, cylindrical nanoantennas. One possible combination nanoantenna is shown in fig. 6, which is formed by combining 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 nano-antenna structure 45 includes a transparent medium 47c therein, and the transparent medium 47c covers at least one nano-antenna. In addition, optionally, as shown in fig. 7B, the nano-antenna structure 45 further includes an adjustable material, where a material characteristic of the adjustable material, such as a constitutive parameter of the adjustable material, is adjustable.

The polarizing layer 44 is disposed on the light emitting side of the first light emitting pixel 43, and the polarizing layer 44 includes liquid crystal molecules for controlling the polarizing direction of the second light beam, so as to convert the first light beam into the second light beam and then emit the second light beam.

The second control circuit 42 is connected to the polarizing layer 44 or the nano-antenna structure 45, as shown in fig. 5 or fig. 8, and can change the scattering angle of the third light beam, where the third light beam is an outgoing light beam of the second light beam after passing through the nano-antenna structure 45.

Specifically, the second control circuit 42 is connected to the polarizing layer 44 or the nano-antenna structure 45, and is configured to switch the operation mode of the nano-antenna structure 45 between satisfying the Ke Erke Kerker condition and not satisfying the Kerker condition. When the operation mode of the nano-antenna structure 45 is switched between satisfying the Ke Erke Kerker condition and not satisfying the Kerker condition, the scattering angle of the third light beam changes.

First, an embodiment is described in which the second control circuit 42 is connected to the polarization layer 44 to control the nano-antenna structure 45 to switch between meeting and not meeting Kerker conditions.

The second control circuit 42 is connected to the polarization layer 44 under the condition that the nano-antenna structure 45 is unchanged, and the second control circuit 42 is configured to apply a voltage to the polarization layer 44 to change the polarization direction of the second light beam, so that the scattering angle of the third light beam emitted through the nano-antenna structure 45 is changed.

Wherein the conditions under which the nano-antenna structure 45 is unchanged include: the pole mode of the nano antenna itself and the material around the nano antenna are not changeable, i.e. the nano antenna structure in the nano antenna structure 45 is fixed, and the material characteristics of the material around the nano antenna are unchanged.

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

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

When the second control circuit 42 applies the first voltage to the polarizing layer 44, the polarizing layer 44 can control the polarizing direction of the second light beam to be parallel to the bottom side length of the geometrical nano-antenna, so that the working mode of the nano-antenna structure 45 meets the Kerker condition, thereby changing the scattering angle of the third light beam to form a narrow scattering angle range, and the peeping-preventing display mode is adopted at this time.

Optionally, when the operation mode of the nano antenna structure 45 meets the Kerker condition, the scattering angle of the third beam is a first angle, and when the operation mode of the nano antenna structure 45 does not meet the Kerker condition, the scattering angle of the third 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, the preset voltage is a preset value, or any value belonging to a preset range, and the first voltage can be controlled to be applied or turned off by the second control circuit 42, so that the setting process of the first voltage is not limited in this embodiment.

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

Alternatively, in another example, when the geometry nano-antenna is a combined nano-antenna, as shown in fig. 10C, the combined nano-antenna structure is composed of a cube and a cuboid, and the cube is disposed on the cuboid, the bottom surface of the combined nano-antenna is a side surface of the cuboid, the longer side length of the side surface is L1, and the second control circuit 42 controls the polarization direction of the second beam so as to be parallel to the direction of the side length L1 of the bottom surface, at this time, the working mode of the nano-antenna structure 45 satisfies the Kerker condition, and forms a visible angle with a narrow scattering range.

Alternatively, in yet another example, when the geometric nano-antenna is a cylindrical nano-antenna, as shown in fig. 10E, the bottom surface of the cylindrical nano-antenna is elliptical. Assuming that the center of the ellipse is 01, the major axis of the ellipse is AB, and the minor axis of the ellipse is CD. When the polarization direction of the second light beam is controlled to be parallel to the long axis AB of the bottom surface of the cylindrical nano antenna, the working mode of the nano antenna structure 45 satisfies the Kerker condition, and a visible angle with a narrow scattering range is formed.

In addition, when the second control circuit 42 stops applying the first voltage to the polarization layer 44, or the applied voltage is greater than or less than the first voltage, the first light beam becomes a second light beam after being polarized by the polarization layer 44, the second light beam is directed to the nano antenna structure 45, and then the third light beam emitted after passing through the nano antenna structure 45 does not meet the Kerker condition, and a range of wide scattering angles is formed.

Specifically, in the example where the nano-antenna structure is a cubic nano-antenna, as shown in fig. 18B, or in the example where the nano-antenna structure is a combined nano-antenna, as shown in fig. 18D, when the polarization layer 44 controls the polarization direction of the second light beam to be non-parallel to the bottom side length a, for example, the polarization direction is along the diagonal direction of the bottom side length a and the bottom side length B, at this time, the scattering angle of the third light beam emitted after passing through the nano-antenna structure 45 diverges outwards, and the Kerker condition is not satisfied, and a wide scattering range of visible angle is formed at this time.

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 (i.e., the second light beam) is parallel to the bottom side length of the cubic nano-antenna, so that the passing length of the light in the cubic nano-antenna is equal to the bottom side length of the cubic nano-antenna, and the structure of the nano-antenna is combined to excite the polar mode meeting the Kerker condition, so as to generate a visible angle with a narrow scattering range.

Similarly, in the example where the nano-antenna structure is a cylindrical nano-antenna, as shown in fig. 10F, when the polarization layer 44 controls the polarization direction of the second beam to be non-parallel to the long axis AB, for example, when the polarization direction is along the short axis CD direction, or along other directions except the long axis AB, the scattering angle of the third beam emitted after passing through the nano-antenna structure 45 diverges outwards, which does not meet the Kerker condition.

It should be understood that when the bottom surface of the cubic nano-antenna or the combined nano-antenna may be rectangular or square; the bottom surface of the cylindrical nano antenna may be either elliptical or circular, which is not limited in this embodiment.

In this embodiment, the second control circuit is connected to the polarization layer, when the second control circuit applies a certain voltage to the polarization layer, the polarization direction of the first light beam generated by the light emitting pixel is changed after passing through the polarization layer, and the second light beam is emitted, and when the second light beam passes through the nano antenna structure, the polarization direction is parallel to the side length of the bottom surface of the nano antenna structure, and at this time, an electron quadrupole mode and a magnetic quadrupole mode meeting the Kerker condition are excited, the scattering angle of the emitted third light beam is a narrow angle, and the scattering direction is a forward direction, so that the peeping prevention display mode is realized, as shown in fig. 11A, and thus, peeping of people outside the narrow scattering angle range can be effectively prevented.

When the second control circuit does not apply a certain voltage to the polarizing layer, or 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, at this time, the polarizing direction of the incident light (i.e., the first light beam) and the nano antenna structure cannot excite the polar mode meeting the Kerker condition, the scattering angle of the emitted light (i.e., the third light beam) is a wide angle, and the scattering direction is a forward direction, as shown in fig. 11B, so that the normal display mode can be realized.

Optionally, in another embodiment, the polarization direction of the first light beam is kept unchanged, and 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 working mode of the nano antenna structure is switched between meeting and not meeting the Kerker condition.

Specifically, 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 beam.

Wherein the nano-antenna structure 42 comprises an adjustable material, the property of the adjustable material can be changed, and when the second control circuit 42 controls the property of the adjustable material to be changed, the scattering angle of the third light beam is correspondingly changed.

Referring to fig. 12A, a cross-sectional view of a nano-antenna structure comprising tunable materials is shown. Wherein the nano-antenna is divided into two parts, one part is the nano-antenna containing the tunable material, such as the gray area in fig. 12A; the other part is only the nano-antenna, as in the white area in fig. 12A. Wherein both nano-antennas and tunable materials are included in the gray region. In addition, the tunable material is also referred to as a nano-antenna surrounding material.

In addition, the gray area and the white area of the two components of the nano antenna can be other structures. For example, as shown in fig. 12B, the nano-antenna (gray area) containing the tunable material is arranged side by side with the nano-antenna (white area). Alternatively, as shown in fig. 12C, the nano-antenna (gray area) containing the tunable material wraps the nano-antenna (white area), wherein the nano-antenna and the nano-antenna containing the tunable material are both spherical or cylindrical structures. The structure and the connection position relationship of the two components of the nano antenna are not limited in the embodiment.

The structure of the nano-antenna in the two components of the nano-antenna can be any geometrical nano-antenna in the previous embodiment, 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, where the transparent medium 47c is located between the transparent electrodes 46a and 46b, as shown in fig. 13, for fixing the nano-antenna structure.

In any of the foregoing nano-antenna structures 45 of fig. 12A-12C, the intrinsic parameters of the tunable material of the nano-antenna comprising the tunable material are tunable. The constitutive parameter is a variable parameter in the adjustable material and is used for describing the characteristics of the adjustable material. When a voltage is applied to the tunable material by the second control circuit 42, a constitutive parameter of the tunable material may be changed, thereby changing the state of the tunable material.

Wherein the constitutive parameters include permittivity, permeability, conductivity, and the like. The tunable materials include but are not limited to germanium antimony tellurium, vanadium oxide, antimony telluride, bismuth ferrite and the like.

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. The germanium antimony tellurium material can be switched between a crystalline state and an amorphous state under certain voltage control. Specifically, under the voltage applied by the second control circuit, the specific gravity of the antimony metal content and the germanium metal content is changed, and the crystallization speed is increased and the crystallization temperature is reduced along with the increase of the antimony content; and as the germanium content increases, the crystallization time increases and the crystallization temperature increases.

When the germanium antimony tellurium material changes between crystalline and amorphous states, the dielectric constant changes significantly, thereby resulting in a in the nano-antenna structure _e And alpha _m And (3) a change. Wherein alpha is _e Represents the electrical composite scalar polarization rate of the nano antenna per se, alpha _m Representing magnetic composite scalar polarizability, alpha _e And alpha _m The corresponding polarization modes are electrode sub-mode and pole sub-mode, respectively. When designing the nano antenna, the nano antenna structure containing the adjustable material can be designed to meet the Kerker condition according to the crystalline dielectric constant, and the visible angle with a narrow scattering range can be formed.

When the voltage applied by the second control circuit to the germanium antimony tellurium material changes the dielectric constant to change the germanium antimony tellurium material from a crystalline state to an amorphous state, a polar mode meeting the Kerker condition cannot be excited, so that a common visible angle with a wide scattering range is formed.

For another example, when the tunable material is a vanadium oxide material, the second control circuit 42 may change the conductivity of the vanadium oxide material when a voltage is applied to the vanadium oxide material, so that the state of the vanadium oxide phase change material is switched between a dielectric state and a metal state, and when the vanadium oxide material is in the dielectric state, a polar mode satisfying the Kerker condition may be excited, a scattering angle of the third light beam is changed, and a forward light beam with a narrow scattering angle is emitted. When the vanadium oxide material is changed from a medium state to a metal state, the scattering angle of the third light beam is changed, and a light beam with a wide scattering angle is emitted outwards, and the Kerker condition is not met.

For another example, when the tunable material includes both germanium antimony tellurium material and vanadium oxide material, the second control circuit 42 applies to the tunable material while varying the dielectric constant in the germanium antimony tellurium material and the electrical conductivity in the vanadium oxide material such that the germanium antimony tellurium material is in a crystalline state and the vanadium oxide material is in a dielectric state.

In another possible implementation, the tunable material is a liquid crystal material. As shown in fig. 12D, the liquid crystal material includes liquid crystal molecules, and for convenience of description, it is assumed in this embodiment that the structure of the liquid crystal molecules is an ellipsoid or an oblate spheroid, and the liquid crystal molecules are filled in the transparent medium 47c, that is, it is understood that the transparent medium 47c contains the liquid crystal material. Wherein, the long axis direction of at least part or all liquid crystal molecules can be regulated by the voltage applied by the control circuit. At this time, the nano-antenna is a pure medium, which does not contain tunable materials.

In yet another possible implementation, the tunable material includes both a liquid crystal material and germanium antimony tellurium, vanadium oxide, and the like, as shown in fig. 12E. Combining fig. 12A and 12D results in a tunable material that includes two tunable properties. One is that the constitutive parameters of the tunable material of the gray area portion of fig. 12E can be tuned; the other is that the long axis direction of the liquid crystal molecule in fig. 12E can be adjusted, so that the two parts are adjusted under the action of a certain voltage to excite the polar mode of the nano antenna structure meeting the Kerker condition.

The following describes the process of switching between the above-described nanoantenna structures containing tunable materials, when a voltage is applied, to excite the nanoantenna structures between satisfying and not satisfying the Kerker condition.

Fig. 13 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 via transparent electrodes 46a and 46 b.

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

When the second control circuit 42 changes the dielectric constant in the germanium antimony tellurium material so that the germanium antimony tellurium material changes from a crystalline state to an amorphous state, the second light beam passes through the third light beam emitted by the nano antenna structure 45, and the Kerker condition is not satisfied, the scattering angle of the third light beam is a wide angle range, and the scattering direction is a 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 tunable material in the nano-antenna structure 45 by applying a voltage to the nano-antenna structure 45, so as to change the scattering angle of the third beam, and generate a forward beam with a narrow scattering angle, which is the same as the embodiment shown in fig. 13, and will not be repeated here.

In this embodiment, a part of metal is provided 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 material around the nano antenna can be adjusted, and the beneficial effect of changing the scattering angle of the third beam is achieved.

Further, in this embodiment, the polarization direction of the light beam in the polarization layer is kept unchanged, a nano antenna structure including an adjustable material is provided, and a certain voltage is applied by a control circuit to change a constitutive parameter in the nano material, so that the state of the adjustable material is changed, for example, from an amorphous state to a crystalline state, or from a metal state to a dielectric state, so that an outgoing light beam (i.e., the third light beam) after passing through the nano antenna structure forms a forward light beam with a narrow scattering angle, thereby realizing peep-proof display.

In another implementation, as shown in fig. 14, the nano-antenna structure 45 is the structure shown in fig. 12D, the tunable material is a liquid crystal material, the liquid crystal material includes liquid crystal molecules therein, and the liquid crystal molecules are filled in the transparent medium 47 c. The specific adjusting process comprises the following steps:

when the first light beam passes through the polarizing layer 44 to generate a second light beam, the polarizing direction of the second light beam in the polarizing layer 44 is not changed, and the second light beam is directed to the nano-antenna structure 45, the second control circuit 42 applies a certain voltage to the nano-antenna structure 45 through the transparent electrodes 46a and 46b, and the long axis direction of the liquid crystal molecules in the nano-antenna structure 45 is changed under the action of the voltage. As shown in fig. 15A, before the voltage is applied to 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. 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. 15A, and at this time, the scattering angle of the third light beam emitted by the second light beam after passing through the nano-antenna structure 45 is larger.

When a certain voltage is applied to the second control circuit 42, the long axis direction of the liquid crystal molecules in the liquid crystal material is changed to be parallel to the bottom surface of the nano antenna, as shown in fig. 15B, when the applied voltage reaches a preset value, the long axis direction of most or all of the liquid crystal molecules is instantaneously 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 a third light beam is emitted outwards, the third light beam forms a forward light beam with a narrow scattering angle, and the working mode of the nano antenna structure meets the Kerker condition.

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

In this embodiment, the nano antenna structure is configured to include a liquid crystal material, so that a direction of a long axis of the liquid crystal molecule in the liquid crystal material can be changed under the action of a certain voltage, so that most or all of the long axis direction of the liquid crystal molecule is parallel to a bottom surface of the nano antenna, and a polar mode of the nano antenna structure meeting a Kerker condition can be excited, so that a third light beam emitted outwards is a forward light beam with a narrow scattering angle, and thus an anti-peeping effect is achieved.

In yet another implementation, as shown in fig. 16, the nano-antenna structure 45 may also be a structure as shown in fig. 12E, that is, the nano-antenna structure 45 includes both a liquid crystal material and a material such as germanium antimony tellurium, vanadium oxide, and the like.

Under the nano-antenna structure shown in fig. 16, the electrode mode of the nano-antenna structure meets the Kerker condition by adjusting the matching degree of the two adjustable materials, so as to realize the switching between the normal display mode and the peep-proof display mode, wherein the propagation direction of the light beam in the nano-antenna structure 45 is similar to that shown in the foregoing fig. 13 and 14.

Specifically, the second control circuit 42 applies a certain voltage to the nano-antenna structure 45 through the transparent electrodes 46a and 46b, and under the action of the voltage, on one hand, the intrinsic parameters of the germanium antimony tellurium material or the vanadium oxide material in the nano-antenna (gray area) containing the tunable material, such as dielectric constant, conductivity, etc., are changed, so that the state of the tunable material is crystalline or dielectric; on the other hand, the long axis direction of the liquid crystal molecules in the transparent medium 47c is changed, so that most or all of the long axis directions of the liquid crystal molecules are parallel to the bottom surface direction of the nano antenna, and the Kerker condition is satisfied, so that the scattering angle of the third light beam is a narrow angle, and the scattering direction is a forward direction. The specific adjustment process is referred to in the foregoing descriptions of fig. 13 and 14, and will not be repeated here.

In this embodiment, the nano antenna structure includes two parts of adjustable materials, including metal adjustable materials, such as germanium antimony tellurium and vanadium oxide materials, and also includes a liquid crystal material, so that the design flexibility is further improved at multiple angles, and the use condition in a real scene can be better matched.

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

The nano antenna structure in the display device has the characteristic of light wave regulation, wherein one main characteristic is that electromagnetic wave energy can be intensively radiated to a certain designated direction, namely, the directionality can be understood. In the foregoing embodiment, the light beam emitted by a single light emitting pixel (such as the first light emitting pixel 43) passes through the polarizing layer or the nano antenna structure, and then the polarization direction of the incident light or the material characteristic in the nano antenna structure is changed, so as to change the scattering angle range of the outgoing third light beam, so that the working mode of the nano antenna structure can be switched between meeting the Kerker condition and not meeting the Kerker condition.

In theory, when there are a plurality of light emitting pixels and a plurality of nano antenna structures, the voltage is applied by the control circuit, so that the emergent light beams in a plurality of directions can be regulated and obtained, and the scattering ranges of different angles are formed.

Referring to the structure of the display device of fig. 4, the function of the controller 20 is mainly described in this embodiment, and the peep-proof display function of the display device in different scenes can be realized by the adjusting function of the controller 20.

In an indoor application scenario, as shown in fig. 17, the scenario includes a display device, where the display device is the device shown in fig. 4, and includes a controller 20 and a display device 40, where the controller 20 is connected to the display 40 through a circuit board 30, and the display device 40 is a display device according to any one of the foregoing embodiments.

In addition, the scene further includes users who view the display device, in this embodiment, it is assumed that 3 users view the display device, and the 3 users are a, b, and c, respectively. The target user is a user which is actually needed to be presented by the display device, and other users which are the target user are users which need peeping prevention. In this example, it is assumed that the user b is the target user, and the users a and c are users to be peeped-proof.

In order to realize peep-proof display for other users than the target user, the embodiment provides a method for adjusting a display device, as shown in fig. 18, the method includes:

101: and acquiring a first instruction of a first target user, wherein the first instruction is used for indicating the display device to start the peep-proof display mode.

The first instruction may be manually triggered by the first target user, or may be configured to be in the peep-proof display mode by default when the display device is started. For example, one way is that the user b triggers the first instruction by means of a remote controller, a touch display screen, or a keyboard shortcut key. Alternatively, activating the default configuration function when the camera is positioned to the first target user triggers the first instruction. After the controller of the display device acquires the first instruction, starting an anti-peeping display mode of the display device.

Optionally, the triggering manner may be implemented through a User Interface (UI) of the display device, issuing a voice command, and the embodiment is not limited thereto.

102: and sending a second instruction to the display device, wherein the second instruction instructs a second control circuit of the display device to apply voltage to the polarization layer or the nano antenna structure, so that the visual angle of the display device is changed into a first visual angle.

The first visual angle is a narrow scattering angle formed by the working mode of the nano antenna structure of the display device under the condition that Kerker is met, and the scattering direction is a forward direction light beam.

Wherein the first visual angle is determined based on the location of the first target user. Specifically, in one implementation manner, when the controller obtains a first instruction sent by a first target user through a remote controller, the position of the first target user is determined according to the position of the remote controller. Assuming that the position of the first target user b is the same as the position of the remote controller, the controller can obtain the position of the user b by locating the position of the remote controller.

In this embodiment, if the position where the user b triggers the first instruction is the first position, the first visual angle is determined according to the first position.

Optionally, the display device may further determine the first position by using a camera and a face recognition technology. For example, the facial features of the first user, the second user and the third user are respectively obtained through the camera, face recognition is carried out according to the facial features of each user, so that the identity of each user is determined, the position of the target user, the position of the peep-proof user, the relative positions between the target user and the peep-proof user and the like are obtained.

Optionally, if no object requiring peeping prevention is detected near the first target user b, for example, only user b, and no user a and no user c, the display device may select a default viewing angle range.

Prior to step 102, determining the first visual angle from the first position includes: and acquiring a connecting line between the optical axis center of the display device and the first position of the first target user, wherein a view field angle formed by taking the connecting line as a positive and negative 15-degree range of a central line is the first visual angle, and the first visual angle is a 30-degree visual range.

The angle range of 15 ° may be other angles, such as 30 ° or 15 ° to 30 °, which is not limited in this embodiment.

It should be noted that the range of the first visible angle should not exceed the display range of the narrow scattering angle formed by the operation mode of the nano antenna structure under the condition of meeting the Kerker.

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 display unit according to the second instruction, after a first light beam generated by a luminous pixel passes through the polarization layer and the nano antenna structure, the scattering direction of the third light beam is a forward direction, the scattering angle is a narrow angle, the Kerker condition is met, a first visual angle is formed, only a target user B in the first visual angle range can watch the display picture of the display device, and users A and C outside the first visual angle cannot watch the display picture, so that the peeping prevention beneficial effect is achieved.

Further, the process of controlling the control circuit in the display device by the controller may refer to the foregoing embodiment of the display device, and the process of adjusting the exit angle of the light beam in the display device by the controller in this embodiment is not described in detail.

The method provides the technical scheme of peeping prevention display of the target user in the indoor scene, improves the safety of the target user for watching the display picture, and simultaneously increases the flexibility of scheme design.

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

As shown in fig. 19, 20A and 20B, when the first target user B moves from the first position to the second position, the method further includes:

103: a second location of the first target user is acquired, the second location being different from the first location.

The second position may be obtained in the same manner as the first position, or may be obtained by tracking and positioning the first target user with a camera or other sensor.

Or, the signal may be obtained according to a signal sent by the target user at the second location, for example, when the user b is at the second location, a signal or an instruction is sent to the display device through the remote controller, where the signal or the instruction is used to instruct the user b to start the peep-proof display mode.

104: and sending a third instruction to the display device, wherein the third instruction indicates that the visual angle of the display device is changed from the first visual angle to the second visual angle. The second visual angle is determined based on the second location 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 voltage to the polarization layer or the nano-antenna structure according to the third instruction, so that the visual angle is changed from the first visual angle to the second visual angle.

The second viewing angle is an angle range in which a scattering angle of the light beam emitted from the display device is narrow and a scattering direction is biased toward the second position. As shown in fig. 20B, the scattering direction of the light beam emitted from the display device is right, and faces the second position where the user B is located, so that the user B can see the display screen on the display device.

Specifically, the determining process of the second visual angle is the same as the determining process of the first visual angle, for example, a line between a second position where the user b is located and the center of the optical axis of the display device is taken as a center line, and a visual field angle formed by taking the center line as a reference and within a range of plus or minus 15 ° is taken as the second visual angle.

The method realizes flexible adjustment of the visual angle of the display device based on the nano antenna structure, and improves the use experience of users.

Alternatively, the display device may be applied to other application scenarios, as shown in fig. 21, where the display apparatus includes a large-screen display device, where the display device includes at least one display unit, and different pictures may be displayed on different display units, and viewing requirements of two or more target users are satisfied at the same time, and viewing contents between different target users do not affect each other.

The display device including the large screen may be a terminal device, such as a vehicle-mounted terminal, as shown in fig. 21, where the large screen display device is a tablet computer, a vehicle-mounted display screen, or the like, and is used to provide different video images for the primary driver and the secondary driver, and the image contents watched by the primary driver and the secondary driver do not affect each other, that is, anti-peeping display is performed between each other.

It should be understood that the present embodiment proposes that the large screen based display device may also be a small screen device, such as a mobile phone.

As shown in fig. 22, the display device includes two or more display units, and each display unit has the same structure as any one of the foregoing fig. 5, 8, 9, 13, 14, and 16. Referring to fig. 22, a display device including two display units is exemplified. The two display units are a first display unit and a second display unit, respectively, and the first display unit and the second display unit are different.

Wherein the first display unit comprises a light emitting pixel 1, a control circuit, a nano antenna 1, a nano antenna 2 and the like, and the second display unit comprises a light emitting pixel 2, a control circuit, a nano antenna 6, a nano antenna 7 and the like. Wherein the light emitting pixel 1 and the light emitting pixel 2 are two different light emitting pixel units, different light beams can be emitted, and the phase adjustment ranges of the light emitting pixel 1 and the light emitting pixel 2 are 0 degrees to 360 degrees.

Wherein, when the phase of the light emitting pixel 1 is adjustable 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 are matched. Other more specific antenna structures are the same as those of the foregoing embodiments of the display device, and will not be described herein.

Assuming that the display unit of the first visual angle is the first display unit in the foregoing steps 101 to 102, as shown in fig. 23, the foregoing step 102 of changing the visual angle of the display device to the first visual angle includes:

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

For example, the first target user is a primary driver, the second target user is a secondary driver, the display screen content corresponding to the first visual angle is presented as primary driving visual angle content, and the display screen content corresponding to the third visual angle is presented as secondary driving visual angle content. For example, when a main driver needs to watch navigation and map content and a user at a co-driver position needs to watch a movie or browse a webpage, the picture content displayed by the first display unit is navigation and map content, the picture displayed by the second display unit is movie or webpage content, different voltages are applied to the first display unit and the second display unit through the control circuit, so that light beams in the two display units generate different visual angle ranges under the action of the adjustable material characteristics in the polarizing layer and the nano antenna structure, the requirement that the display screen displays different display pictures when different users share one display device is met, meanwhile, anti-peeping display among different users is realized, the display contents are mutually isolated, namely, the main driver can only watch pictures displayed at the first visual angle and cannot watch the display pictures at the third visual angle; similarly, the secondary driver can only view the display at the third viewing angle and cannot view the display at the first viewing angle.

In addition, since the display device with a large screen is selected, the number of pixels on the large screen is large, and therefore, a clearer image quality can be presented to the user, and the display definition can be improved.

Specifically, the process of obtaining and presenting the third visual angle by the second display unit is the same as that of step 102, and reference is made to the description in the foregoing embodiment, which is not repeated here in detail.

Optionally, in the foregoing step 101, the first instruction may further include user information that needs to be displayed for peeping prevention, such as a number of peeping prevention display persons, a peeping prevention display location, and the like.

The number and/or location of the privacy display may be set by the target user or configured by default according to the current scene controller. For example, in the vehicle-mounted area and the automatic driving area, the main driving position (position 1 shown in fig. 21) and the co-driving position (position 2 shown in fig. 21) are visually displayed positions by default. Other positions, such as the rear seat position, are peep-proof display positions, and the other people except the primary driver and the secondary driver are peep-proof display personnel.

The embodiment provides the adjusting method of the display device, and the narrow-range visual angle can be realized based on the same display unit, so that the display effect of the personal protection peeping for the target user is achieved.

Meanwhile, when the position of the target user changes, the position of the target user can be tracked, and the visual angle of the display device can be adaptively adjusted according to the moving position of the target user, so that the beneficial effect that the display picture follows the position adjustment of the target user is achieved, and the use experience of the user is improved.

In addition, the method can also adjust different display units of the display device to display different pictures, so as to support the requirement of the same display screen for viewing different pictures by multiple users, and the different display units have different visual angles for mutual display under the action of different applied voltages, thereby achieving the beneficial effects of no interference of the picture contents watched by multiple users and peeping prevention.

Embodiments of the apparatus corresponding to the above-described method embodiments of the present application are described below.

Fig. 24 is a schematic structural diagram of a controller according to an embodiment of the present application. The controller is configured to implement the adjustment method of the display device in the foregoing embodiment, where the controller may include: an acquisition unit 210, a processing unit 220, a transmission unit 230, and a display unit 240.

In addition, the controller may further include more or fewer units and modules such as a storage unit, and the embodiment does not limit the structure of the apparatus.

The obtaining unit 210 is configured to obtain a first instruction of a first target user, where the first instruction instructs the display device to start a peep-proof display mode; a processing unit 220, configured to generate a second instruction according to the first instruction, where the second instruction instructs a second control circuit of the display device to apply a voltage to a polarization layer or a nano-antenna structure; and a transmitting unit 230, configured to transmit a second instruction to the display device, so that a second control circuit of the display device applies a voltage to the polarization layer or the nano-antenna structure, and change the viewing angle of the display device to the first viewing angle.

The first visual angle is a narrow scattering angle formed by the working mode of the nano antenna structure of the display device under the condition of meeting Ke Erke Kerker, and the scattering direction is a 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 visual angle is determined based on the first location of the first target user.

The processing unit 220 is further configured to obtain a second location of the first target user, and generate a third instruction; a transmitting unit 230, configured to transmit the third instruction to the display device, where the third instruction instructs to change the visual angle of the display device from the first visual angle to the second visual angle; the second visual angle is determined based on a second position of the first target user, the second position being different from the first position, a scattering angle of a light beam of the second visual angle being a narrow angle, a scattering direction being a direction 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 other embodiments, the display device includes a first display unit and a second display unit, and the processing unit 220 is further configured to change a viewing angle of the first display unit of the display device to the first viewing angle; and; changing a viewing angle of the second display unit of the display device to the third viewing angle.

Wherein the first visual angle is determined based on the location of the first target user and the third visual angle is determined based on the location of the second target user. The first target user may be a primary driver in the vehicle and the second target user may be a secondary driver.

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

In a hardware implementation, the embodiment of the application also 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 described above. For example, as shown in fig. 4, the display apparatus 10 includes at least one controller 20, a circuit board 30, and a display device 40.

Wherein, the one controller 20 is connected with 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 a display unit according to any one of the foregoing embodiments.

The at least one controller 20 is configured to control the display device to change the scattering direction of the third light beam, and perform the adjustment method of the display device in the foregoing embodiment, so as to implement the switching of the viewing angle of the display device between the first viewing angle and the third viewing angle.

Furthermore, the at least one controller 20 may further include a memory for storing computer program instructions that, when invoked by the controller, perform the method of adjusting the display device of the foregoing embodiment.

Alternatively, the display device may be a terminal device, and when the display device is a terminal device, the structure of the display device is shown in fig. 25, and the display device includes at least one processor 110, a memory 120, a universal serial bus (universal serial bus, USB) interface 130, a communication module 140, at least one display screen 150, at least one camera 160, an audio module 170, a sensor module 180, a key 190, a power management module 200, and the like.

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

In some embodiments, the processor 110 may include one or more interfaces. The interfaces 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 receiver transmitter (universal asynchronous receiver/transmitter, UART) interface, a mobile industry processor interface (mobile industry processor interface, MIPI), a general-purpose input/output (GPIO) interface, a subscriber identity module (subscriber identity module, SIM) interface, and/or a USB interface 130, among others.

The at least one processor 110 may be the at least one controller 20 described above with respect to fig. 4.

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

The communication module 140 includes: the mobile communication module, the wireless communication module, the radio frequency circuit, the antenna 1, the antenna 2 and other components or modules are used for realizing communication transmission between the terminal equipment and the external equipment, such as receiving the first instruction.

Further, the mobile communication module may provide a solution to apply wireless communication including 2G/3G/4G/5G. The mobile communication module may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA), etc. In some embodiments, at least some of the functional modules of the mobile communication module may be disposed in the processor 110. In other embodiments, at least some of the functional modules of the mobile communication module may be provided in the same device as at least some of the modules of the processor 110.

The wireless communication module may include a wireless fidelity (wireless fidelity, wiFi) module, a Bluetooth (BT) module, a GNSS module, a near field communication technology (near field communication, NFC) module, an Infrared (IR) module, and the like. The wireless communication module may be one or more devices integrating at least one of the modules described above. The wireless communication module receives electromagnetic waves via the antenna 1 or the antenna 2, modulates the electromagnetic wave signals, filters the electromagnetic wave signals, and transmits the processed signals to the processor 110. The wireless communication module may also receive a signal to be transmitted from the processor 110, frequency modulate the signal, amplify the signal, and convert the signal into electromagnetic waves through the antenna 1 or the antenna 2 to radiate the electromagnetic waves.

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

The display 150 is used to display at least one visual angle. The display 150 may be the display device or the display in the foregoing embodiments. The display device or the display may employ a liquid crystal display (liquid crystal display, LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (AMOLED) or an active-matrix organic light-emitting diode (matrix organic light emitting diode), a flex light-emitting diode (FLED), miniLED, microLED, a Micro-OLED, a quantum dot light-emitting diode (quantum dot light emitting diodes, QLED), or the like. In some embodiments, the terminal device may include 1 or N displays, N > 1 and is a positive integer.

The camera 160 is used for capturing images of a user, such as information about facial features of the user. The camera 160 includes a lens and a photosensitive element, and an object is projected to the photosensitive element by generating an optical image through the lens. The photosensitive element may be a charge coupled device (charge coupled device, CCD) or a Complementary Metal Oxide Semiconductor (CMOS) phototransistor. In some embodiments, the terminal device may include 1 or N cameras, N > 1 and is a positive integer.

The NPU is a neural-network (NN) computing processor, and processes input information rapidly by referencing a biological neural network structure, for example, referencing a transmission mode between human brain neurons. Applications such as intelligent cognition of terminal equipment can be realized through NPU, for example: image recognition, face recognition, voice recognition, and the like.

The audio module 170 is coupled to the processor 110 to enable communication between the processor 110 and the audio module 170. In some embodiments, the audio module 170 may transmit an audio signal to the communication module 140 through the I2S interface, to implement a function of answering a call 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 may also transmit audio signals to the communication module 140 through the PCM interface to implement a function of answering a call through the bluetooth headset. Both the I2S interface and the PCM interface may be used for audio communication.

The sensor module 180 includes a touch sensor 1801 and a pressure sensor 1802. Among them, the touch sensor 1801 is also referred to as a "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, which is also referred to as a "touch screen". The touch sensor 1801 is used to detect a touch operation acting thereon or thereabout. The touch sensor may communicate the detected touch operation to the processor to determine the type of touch event. Visual output related to touch operations may be provided through the display 150. In other embodiments, the touch sensor 1801 may also be disposed on a surface of the terminal device at a different location than the display 150. The pressure sensor 1802 is used to measure a pressure value of a user's touch screen. In addition, other sensors such as a gyroscope sensor, an acceleration sensor, a temperature sensor, and the like may also be included.

The keys 190 include a power-on key, a volume key, etc. The keys 190 may be mechanical keys. Or may be a touch key. The terminal device may receive key inputs, generating signal inputs related to user settings of the terminal device and to function control. Such as the target user entering a first instruction via key 190.

The power management module 200 is used to connect the battery to the at least one processor 110. The power management module 200 receives the power of the battery and provides power to at least one processor 110, memory 120, communication module 140, display 150, camera 160, etc. In other embodiments, the power management module 200 may also be disposed in the processor 110.

It will be appreciated that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the terminal device. In other embodiments of the application, the terminal device may include more or less components than illustrated, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

When implemented in software, may be implemented in whole or in part in the form of a computer program product. For example, in the aforementioned apparatus shown in fig. 24, the acquisition unit 210 may be implemented by the communication module 140 and the antenna, the functions of the processing unit 220 and the transmission unit 230 may be implemented by the at least one processor 110, and the display unit 240 may be implemented by the at least one processor 110 and the display screen 150, and the functions of the storage unit may be implemented by the memory 120.

Embodiments of the present application also provide a computer program product comprising one or more computer program instructions. The computer program product may be stored in a memory, which when loaded and executed by a computer, produces in whole or in part the flow or functions described in figures 18, 20 and 23 above. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus.

The computer program instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a network node, computer, server, or data center to another node by wire or wirelessly.

Furthermore, in the description of the present application, unless otherwise indicated, "at least one" means one or more. In addition, in order to facilitate the clear description of the technical solution of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", "third" and the like are used to distinguish the same item or similar items having substantially the same function and effect. Those skilled in the art will appreciate that the words "first," "second," "third," etc. do not limit the number and order of execution.

The embodiments of the present application described above do not limit the scope of the present application.

Claims

A display device, comprising at least one display unit, each display unit comprising: a first control circuit, a light emitting pixel, a polarizing layer, a nano-antenna structure and a second control circuit, wherein,

the first control circuit is connected with the light-emitting pixels, and the first control circuit applies voltage to the light-emitting pixels so that the light-emitting pixels emit first light beams to the polarization layers;

the polarization layer is arranged on the light emitting side of the light emitting pixel and used for controlling the polarization direction of a second light beam, wherein the second light beam is an emergent light beam of the first light beam after passing through the polarization layer;

the nano antenna structure is arranged on one side of the polarization layer, which is far away from the luminous pixel, and is used for controlling the scattering angle of a third light beam, wherein the third light beam is an emergent light beam of the second light beam after passing through the nano antenna structure;

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

The second control circuit is connected with the polarization layer or the nano antenna structure and is used for enabling the working mode of the nano antenna structure to be switched between meeting Ke Erke Kerker conditions and not meeting the Kerker conditions;

when the working mode of the nano antenna structure meets the Kerker condition, the scattering angle of the third light beam is a first angle, and when the working mode of the nano antenna structure does not meet the Kerker condition, the scattering angle of the third light beam is a second angle, and the first angle and the second angle are different.
A 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 with the polarization layer, and applies voltage to the polarization layer to change the polarization direction of the second light beam;

when the polarization direction of the second light beam is changed, the scattering angle of the third light beam is changed.
A display device according to claim 3, wherein the nano-antenna structure comprises a nano-antenna comprising at least one of:

A cubic nanoantenna, a cylindrical nanoantenna, or a combination nanoantenna.
The display device of 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 bottom side length of the cubic nano antenna or the combined nano antenna; or,

and 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 of claim 1 or 2, wherein the nano-antenna structure comprises an adjustable material;

the second control circuit is connected with the nano antenna structure and is used for changing the scattering angle of the third light beam, and the second control circuit comprises:

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

when the characteristics of the tunable material change, the scattering angle of the third light beam changes.
The display device of claim 6, wherein the second control circuit applies a voltage to the tunable material, changing a characteristic of the tunable material, comprising:

The second control circuit applies a voltage to the tunable material to change the tunable 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 tunable material to change the tunable material from an amorphous state to a crystalline state, comprising:

the second control circuit applies a voltage to the tunable material that changes the dielectric constant of the tunable material from amorphous to crystalline.
The display device according to claim 7 or 8, wherein the tunable material comprises: germanium antimony tellurium material.
The display device of claim 6, wherein the second control circuit applies a voltage to the tunable material, changing a characteristic of the tunable material, comprising:

the second control circuit applies a voltage to the tunable material to change the tunable material from a metallic state to a dielectric state.
The display device of claim 10, wherein the second control circuit applies a voltage to the tunable material to change the tunable material from a metallic state to a dielectric state, comprising:

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

the second control circuit applying a voltage to the tunable material to change a characteristic of the tunable material, comprising:

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

acquiring a first instruction of a first target user, wherein the first instruction instructs the display device to start an anti-peeping display mode;

and sending a second instruction to the display device, wherein the second instruction instructs a second control circuit of the display device to apply voltage to the polarization layer or the nano antenna structure, so that the visual angle of the display device is changed into a first visual angle.
The method of claim 14, wherein the first visual angle is determined based on a first location of the first target user, the method further comprising:

Acquiring a second position of the first target user;

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

changing the viewing angle of the display device to a first viewing angle, comprising:

changing a viewing angle of the first display unit of the display device to the first viewing angle, and changing a viewing angle of the second display unit of the display device to the third viewing angle, the first viewing angle being determined based on a location of the first target user, the third viewing angle being determined based on a location of a second target user.
A display device is characterized by comprising a controller, a memory and a display device,

the display device being a device as claimed in any one of claims 1 to 13;

The memory is used for storing computer program instructions;

the controller for executing the computer program instructions implementing the method of any one of claims 14 to 16.