Display device with controllable light path, display equipment and communication equipment

Abstract

The embodiment of the invention provides a display device with a controllable light path, display equipment and communication equipment, and relates to the technical field of display, the display device with the controllable light path comprises a light emitting diode array and light valve glass which are arranged in a stacked mode, and the light valve glass comprises a first glass layer, a light valve control layer and a second glass layer which are sequentially arranged in a stacked mode; the light valve control layer comprises a prism structure and a liquid crystal material, the liquid crystal material is of an oval structure, the refractive index corresponding to the long axis of the liquid crystal material is different from the refractive index corresponding to the short axis of the liquid crystal material, and the refractive index corresponding to the long axis of the liquid crystal material is the same as the refractive index of the prism structure. The refractive index relationship between the liquid crystal material and the prism structure is changed by switching the arrangement direction of the liquid crystal molecules, so that the propagation form of light is controlled, and the controllable adjustment of a light path is realized. The method is suitable for different scenes such as conventional display, privacy peep prevention and directional communication, and the applicability and flexibility of the display device under various use requirements are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a light path controllable display device, display equipment and communication equipment. BACKGROUND

[0002] Micro light emitting diode (Micro LED) is regarded as one of the core directions of the next generation display technology, which can realize self-luminous display by using micron-level (1-100 microns) LED chips as pixel points, and has many advantages such as high brightness, high contrast, low power consumption and long service life. However, with the development of display technology, excellent display effect is not the only trend pursued, and the demand for privacy and variability has gradually become a hot spot.

[0003] At present, in order to change the light path of the display device, a layer of anti-peep film is usually added on the display screen, which not only sacrifices the overall brightness, but also cannot realize the switching of different light paths, and the flexibility is poor. SUMMARY

[0004] The embodiments of the present application provide a light path controllable display device, display equipment and communication equipment to solve the problem of poor flexibility of light path control of the existing display device.

[0005] The embodiment of the present application provides a light path controllable display device, comprising: a light emitting diode array and a light valve glass, the light emitting diode array and the light valve glass are stacked between each other, the light emitting diode array is used for emitting first light to the light valve glass, the light valve glass comprises a first glass layer, a light valve control layer and a second glass layer which are stacked in sequence, the first glass layer is close to the light emitting diode array, the light valve control layer comprises a prism structure and a liquid crystal material, the liquid crystal material is an elliptical structure, and the refractive index corresponding to the long axis of the liquid crystal material is different from the refractive index corresponding to the short axis of the liquid crystal material, and the refractive index corresponding to the long axis of the liquid crystal material is the same as the refractive index of the prism structure.

[0006] When the liquid crystal material is in a first state, the first light passes through the first glass layer and enters the light valve control layer, and under the refraction of the prism structure and the liquid crystal material, the second light passes through the second glass layer and is emitted, the second light is scattered light, and the first state is that the short axis of the liquid crystal material is parallel to the incident direction of the first light.

[0007] When the liquid crystal material is in the second state, the first light ray passes through the first glass layer, enters the light valve control layer, and under the refraction of the prism structure and the liquid crystal material, a third light ray is emitted through the second glass layer, the first light ray and the third light ray are both straight light, and the second state is that the long axis of the liquid crystal material is parallel to the incident direction of the first light ray.

[0008] Optionally, the light valve control layer further comprises a first conductive layer and a second conductive layer, the prism structure and the liquid crystal material are arranged between the first conductive layer and the second conductive layer, the first conductive layer is arranged on the surface of the first glass layer close to the liquid crystal material, the second conductive layer is arranged on the surface of the second glass layer close to the prism structure, and the prism structure is arranged on the surface of the second conductive layer close to the liquid crystal material, and the liquid crystal material is arranged between the first conductive layer and the prism structure.

[0009] When the first conductive layer and the second conductive layer are powered on, an electric field formed between the first conductive layer and the second conductive layer is used to switch the state of the liquid crystal material.

[0010] Optionally, the first conductive layer and the second conductive layer are both indium tin oxide (ITO) layers.

[0011] Optionally, the light valve glass is arranged between the first compensation film and the second compensation film, and the first compensation film is arranged on the surface of the first glass layer close to the light-emitting diode array, and the second compensation film is arranged on the surface of the second glass layer away from the light valve glass.

[0012] Optionally, the light-emitting diode array comprises a substrate and a plurality of light-emitting diodes arranged in an array on the substrate, and each light-emitting diode is provided with a lens structure on the side close to the light valve glass, and the lens structure is used to converge the light ray emitted by the light-emitting diode into the first light ray.

[0013] Optionally, the front frame and the back plate are further provided, the front frame and the back plate cooperate to form a containing cavity, the light-emitting diode array and the light valve glass are arranged in the containing cavity, the light-emitting diode array is arranged on the back plate, a part of the front frame abuts against the edge of the light valve glass, and the other part of the front frame is connected with the back plate.

[0014] Optionally, a heat-conducting adhesive is arranged between the light-emitting diode array and the back plate.

[0015] Optionally, a buffer pad is arranged between the front frame and the light valve glass.

[0016] The embodiment of the present application also provides a display device comprising the light path controllable display device, wherein the liquid crystal material is switched from the first state to the second state when the display device starts a privacy mode.

[0017] The embodiment of the present application also provides a communication device comprising a signal receiving module, a position adjusting module and the light path controllable display device, wherein the position adjusting module adjusts the angle between the light path controllable display device and a target source according to position information when the liquid crystal material is in the first state and the signal receiving module receives the position information sent by the target source, so that the light valve glass is directed to the target source, and the liquid crystal material is switched from the first state to the second state to send the light signal corresponding to the third light to the target source.

[0018] The position information is the position information of the target source sent by the target source when the target source receives the light signal corresponding to the second light.

[0019] In the embodiment of the present application, the light-emitting diode array is stacked with the light valve glass as a light source, and the light path is controlled based on the birefringence characteristics of the liquid crystal material in the light valve glass. When the liquid crystal material is in the first state, the refractive index of the liquid crystal material is different from the prism structure, the light is scattered after being refracted by the light valve control layer, and the scattered light is emitted, which is suitable for regular display with large viewing angle; when the liquid crystal material is switched to the second state, the refractive index of the liquid crystal material is the same as the prism structure, the light is emitted as straight light without deflection, which meets the requirements of peep-proof or directional light communication. In this way, by switching the arrangement direction of the liquid crystal molecules, the refractive index relationship between the liquid crystal material and the prism structure is changed, so as to control the propagation mode of the light, and the light path is controllably adjusted. It is suitable for different scenes such as regular display, privacy peep-proof, directional communication and the like, and the applicability and flexibility of the display device under various use requirements are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is one of the structural schematic diagrams of the light path controllable display device provided by the embodiment of the present application;

[0022] Figure 2 is the second structural schematic diagram of the light path controllable display device provided by the embodiment of the present application;

[0023] Figure 3 is one of working schematic diagrams of the light valve glass in the display device with controllable light path provided by the embodiment of the present application;

[0024] Figure 4 is another working schematic diagram of the light valve glass in the display device with controllable light path provided by the embodiment of the present application;

[0025] Figure 5 is one of working schematic diagrams of the communication device provided by the embodiment of the present application;

[0026] Figure 6 is another working schematic diagram of the communication device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the structures used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a category, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0029] As shown in Figures 1 to 2 The embodiment of the present application provides a display device with controllable light path, which comprises a light-emitting diode array 10 and a light valve glass 20, the light-emitting diode array 10 and the light valve glass 20 are stacked, the light-emitting diode array 10 is used for emitting first light to the light valve glass 20, the light valve glass 20 comprises a first glass layer 201, a light valve control layer and a second glass layer 202 which are stacked in sequence, the first glass layer 201 is close to the light-emitting diode array 10, the light valve control layer comprises a prism structure 203 and a liquid crystal material 204, the liquid crystal material 204 is an elliptical structure, the refractive index corresponding to the long axis of the liquid crystal material 204 is different from the refractive index corresponding to the short axis of the liquid crystal material 204, and the refractive index corresponding to the long axis of the liquid crystal material 204 is the same as the refractive index of the prism structure 203.

[0030] When the liquid crystal material 204 is in the first state, the first light passes through the first glass layer 201, enters the light valve control layer, and under the refraction of the prism structure 203 and the liquid crystal material 204, the second light passes through the second glass layer 202, the second light is scattered light, and the first state is that the short axis of the liquid crystal material 204 is parallel to the incident direction of the first light;

[0031] When the liquid crystal material 204 is in the second state, the first light passes through the first glass layer 201, enters the light valve control layer, and under the refraction of the prism structure 203 and the liquid crystal material 204, the third light passes through the second glass layer 202, the first light and the third light are both straight light, and the second state is that the long axis of the liquid crystal material 204 is parallel to the incident direction of the first light.

[0032] Wherein, the light-emitting diode array 10 is stacked with the light valve glass 20 as a light-emitting source, and the light path control is realized through the light valve control layer in the light valve glass 20. The first glass layer 201 and the second glass layer 202 are respectively located on the two side surfaces of the light valve control layer, and play the roles of light transmission and support protection. The light valve control layer as the core layer to realize different light path switching can include a prism structure 203 and a liquid crystal material 204. Among them, the liquid crystal material 204 is designed as an elliptical structure, has birefringence, the refractive index in the long axis direction is different from the refractive index in the short axis direction, and the long axis refractive index is exactly the same as the refractive index of the prism structure 203, for example, the refractive index in the long axis direction of the liquid crystal material 204 (denoted as n1) is different from the refractive index in the short axis direction (denoted as n2), and n1 is exactly equal to the refractive index of the prism structure (denoted as n0), that is, n1=n0, n2≠n0. The liquid crystal material 204 can be switched between the first state and the second state by applying or not applying electricity to the light valve glass 20, so as to change the arrangement direction of the liquid crystal molecules, and further change the refractive index of the liquid crystal material 204. In this way, when the light passes through the medium with the same refractive index, no deflection occurs; and when the light passes through the medium with different refractive indexes, deflection occurs, thereby realizing different light path switching.

[0033] In an example, the light valve glass 20 is not electrified, and there is no electric field effect, the liquid crystal molecules are arranged according to the constraint direction of the orientation film, that is, the short axis direction of the liquid crystal material 204 is parallel to the propagation direction of the first light. At this time, when the light passes through the liquid crystal, the corresponding effective refractive index is the short axis refractive index n2; since n2≠n0 (the short axis refractive index of the liquid crystal ≠ the refractive index of the prism structure), therefore, when the light passes through the interface between the liquid crystal material 204 and the prism structure 203, multi-angle deflection occurs due to the refractive index mutation; the deflected light passes through the second glass layer in the form of scattered light (i.e. the second light), forming a large viewing angle light path, as shown inFigure 3 As shown, the second light can be received from different angles.

[0034] In another example, the light valve glass 20 is powered on to form an electric field, which drives the liquid crystal molecules to rotate, that is, the long axis direction of the liquid crystal material 204 is parallel to the propagation direction of the first light. At this time, when the light passes through the liquid crystal, the corresponding effective refractive index is the long axis refractive index n1; since n1=n0 (the long axis refractive index of the liquid crystal = the refractive index of the prism structure), there is no refractive index jump when the light passes through the interface between the liquid crystal material 204 and the prism structure 203, and the original propagation direction is not deflected; the non-deflected light is emitted in the form of direct light (i.e., the third light) through the second glass layer, forming a small viewing angle light path, as shown in Figure 4 As shown, the second light can be received only in the direction perpendicular to the light valve glass 20, which is suitable for privacy display or directional optical communication.

[0035] In this embodiment, the light-emitting diode array 10 is stacked with the light valve glass 20 as a light source, and the light path control is realized based on the birefringence characteristics of the liquid crystal material 204 in the light valve glass 20. When the liquid crystal material 204 is in the first state (i.e., the short axis is parallel to the first light incident direction), the refractive index of the liquid crystal material 204 is different from that of the prism structure 203, the light is refracted through the light valve control layer and emitted in the form of scattered light (i.e., the second light), which is suitable for general display with a large viewing angle; when the liquid crystal material 204 is switched to the second state (i.e., the long axis is parallel to the first light incident direction), the refractive index of the liquid crystal material 204 is the same as that of the prism structure 203, and the light is emitted without deflection in the form of direct light (i.e., the third light), which meets the needs of privacy display or directional optical communication. In this way, by switching the arrangement direction of the liquid crystal molecules, the refractive index relationship between the liquid crystal material 204 and the prism structure 203 is changed, thereby controlling the propagation form of the light and realizing the controllable adjustment of the light path. It is suitable for different scenes such as general display, privacy display, directional communication, etc., and improves the applicability and flexibility of the display device under various use requirements.

[0036] Optionally, the light valve control layer further comprises a first conductive layer 205 and a second conductive layer 206, the prism structure 203 and the liquid crystal material 204 are arranged between the first conductive layer 205 and the second conductive layer 206, the first conductive layer 205 is arranged on the surface of the first glass layer 201 close to the liquid crystal material 204, the second conductive layer 206 is arranged on the surface of the second glass layer 202 close to the prism structure 203, and the prism structure 203 is arranged on the surface of the second conductive layer 206 close to the liquid crystal material 204, and the liquid crystal material 204 is arranged between the first conductive layer 205 and the prism structure 203;

[0037] In the case of energizing the first conductive layer 205 and the second conductive layer 206, an electric field formed between the first conductive layer 205 and the second conductive layer 206 is used to switch the state of the liquid crystal material 204.

[0038] In the embodiment, the light-emitting diode array 10 emits light as a light-emitting source, and along the direction of light propagation, the light valve control layer comprises, in sequence, the first glass layer 201, the first conductive layer 205, the liquid crystal material 204, the prism structure 203, the second conductive layer 206, and the second glass layer 202. The first conductive layer 205 is tightly attached to the inner side surface of the first glass layer 201 (i.e., the side close to the liquid crystal material 204) to serve as the lower electrode of the electric field and is directly adjacent to the liquid crystal material 204; the second conductive layer 206 is tightly attached to the inner side surface of the second glass layer 202 (i.e., the side close to the prism structure 203) to serve as the upper electrode of the electric field, and the prism structure 203 is directly attached to the side close to the liquid crystal material 204; the liquid crystal material 204 is filled between the first conductive layer 205 and the second conductive layer 206, so that the liquid crystal material 204 can be fully covered by the electric field formed by the conductive layers, ensuring the uniformity of state switching.

[0039] For example, before energization, the liquid crystal material 204 is arranged in the direction constrained by the orientation film, i.e., the short axis is parallel to the incident direction of the first light, at this time, the state of the liquid crystal material 204 can be recorded as the first state, and the light is deflected due to the difference in refractive index between the liquid crystal and the prism, so the output is scattered light; after energization, the electric field drives the liquid crystal molecules to rotate, so that they change from short-axis alignment to incident light to long-axis alignment to incident light, at this time, the state of the liquid crystal material 204 can be recorded as the second state, and the light is not deflected due to the same refractive index between the liquid crystal and the prism, so the light is output as direct light; after de-energization, the liquid crystal molecules lose the driving force of the electric field and return to the first state, realizing the reversible switching of the state of the liquid crystal material 204. In this way, the liquid crystal state can be quickly switched by the electric field between the first conductive layer 205 and the second conductive layer 206, with fast response speed and light and thin structure.

[0040] In an example, the light valve glass 20 is not energized, there is no electric field between the first conductive layer 205 and the second conductive layer 206, and the liquid crystal molecules are arranged in the direction constrained by the orientation film, i.e., the short axis direction of the liquid crystal material 204 is parallel to the propagation direction of the first light. At this time, the short-axis refractive index of the liquid crystal is not the same as the refractive index of the prism structure, and when the light passes through the interface between the liquid crystal material 204 and the prism structure 203, it will be deflected at multiple angles due to the sudden change in refractive index; the deflected light is in the form of scattered light (i.e., the second light) and is emitted through the second glass layer, forming a large-angle light path, as shown in Figure 3 , which can be received from different angles.

[0041] In another example, the light valve glass 20 is powered on, an electric field is formed between the first conductive layer 205 and the second conductive layer 206, the electric field drives the rotation of the liquid crystal molecules, that is, the long axis direction of the liquid crystal material 204 is parallel to the propagation direction of the first light. At this time, the refractive index of the liquid crystal long axis is the same as the refractive index of the prism structure, and when the light passes through the interface between the liquid crystal material 204 and the prism structure 203, there is no refractive index jump, and the original propagation direction is not deflected; the non-deflected light still takes the form of direct light (i.e. the third light) and is emitted through the second glass layer, forming a small viewing angle light path, as shown in Figure 4 The second light can only be received vertically to the light valve glass 20, which is suitable for anti-peep display or directional optical communication.

[0042] Alternatively, the first conductive layer 205 and the second conductive layer can each be an indium tin oxide (ITO) layer. The ITO layer has high transparency and excellent conductivity. Its high transparency ensures that the first light emitted by the light-emitting diode array 10 can pass through the conductive layer into the light valve control layer without obstruction and low loss, avoiding the influence of insufficient light transmittance of the conductive layer on display brightness or light path propagation efficiency. Its stable conductivity can quickly form a uniform electric field covering the liquid crystal material region when powered on, ensuring that the liquid crystal molecules are synchronized and accurately switched to the first state (short axis alignment with incident light) or the second state (long axis alignment with incident light), avoiding local light path regulation failure caused by uneven electric field. At the same time, the ITO layer has strong chemical stability and is not prone to oxidation or corrosion in long-term contact with glass layers, liquid crystal materials and other components, which can prolong the service life of the device. Its characteristic of being able to be made into an ultra-thin film does not increase the thickness and weight of the light valve glass, which is suitable for the design requirements of light and thin display devices, and ultimately ensures the reliability of light path switching and overall performance stability of the device in conventional display, anti-peep, directional communication and other scenarios.

[0043] Alternatively, it also includes a first compensation film 30 and a second compensation film 40, the light valve glass 20 is arranged between the first compensation film 30 and the second compensation film 40, and the first compensation film 30 is arranged on the surface of the first glass layer 201 close to the light-emitting diode array 10, and the second compensation film 40 is arranged on the surface of the second glass layer 202 away from the light valve glass 20.

[0044] In this embodiment, the first compensation film 30 is attached to the surface of the first glass layer 201 close to the light-emitting diode array 10, which can provide a stable incident light basis for the light entering the light valve glass 20, reduce the influence of stray light between the light valve glass 20 and the light-emitting diode array 10, and the second compensation film 40 is attached to the light-emitting side of the second glass layer 202, which can effectively reduce the entry of stray light in strong light environment and avoid the situation of screen reflection and whitening. In this way, the display picture can remain clear, uniform and true in color under different viewing angles and different light environments, improving the display effect of the display device.

[0045] Optionally, the light-emitting diode array 10 comprises a substrate 101 and a plurality of light-emitting diodes 102 arranged in an array on the substrate 101, each light-emitting diode 102 is provided with a lens structure 1021, the lens structure 1021 is located on the side of the light-emitting diode close to the light valve glass 20, and the lens structure 1021 is used to converge the light emitted by the light-emitting diode 102 into the first light.

[0046] In this embodiment, the lens structure 1021 can be a structure formed on the light-emitting diode 102 by dispensing. Through the lens structure 1021, the divergent light emitted by the light-emitting diode 102 can be converged and integrated, which is converted into first light with more unified directionality and more concentrated energy. It ensures that the light can be efficiently and directionally emitted to the first glass layer 201 of the light valve glass 20, providing stable incident light conditions for the precise light path regulation of the light valve control layer, effectively avoiding the problems of energy loss or reduction of light path regulation accuracy caused by excessive divergence of light, and protecting the overall display or communication performance of the device.

[0047] The substrate 101 provides a bearing basis for the arrayed mounting of the plurality of light-emitting diodes 102, ensures their stable arrangement to form the light-emitting diode array 10, and provides structural support and mounting positioning for the operation of the light-emitting diodes 102.

[0048] Optionally, it also comprises a front frame 50 and a back plate 60, the front frame 50 cooperates with the back plate 60 to form a containing cavity, the light-emitting diode array 10 and the light valve glass 20 are located in the containing cavity, and the light-emitting diode array 10 is arranged on the back plate 60, a part of the front frame 50 abuts against the edge of the light valve glass 20, and another part of the front frame 50 is connected with the back plate 60.

[0049] In this embodiment, the light-emitting diode array 10 and the light valve glass 20 are arranged in the containing cavity to achieve protection. The back plate 60 provides a stable mounting support surface as a bearing basis, ensuring its position fixed. The front frame 50 realizes double functions through structural adaptation. A part of the front frame 50 tightly abuts against the edge of the light valve glass 20 to limit and fix the light valve glass 20, preventing displacement of the light valve glass 20 during use. Another part of the front frame 50 is reliably connected with the back plate 60 to stably constrain the core components such as the light-emitting diode array 10 and the light valve glass 20 in the containing cavity, which not only ensures the layering position accuracy of the components to ensure smooth light path propagation, but also isolates external dust, impact and other interference to protect the integrity and working stability of the internal core structure.

[0050] Optionally, a heat-conducting glue is arranged between the light-emitting diode array 10 and the back plate 60.

[0051] In the embodiment, the heat-conductive glue can fill the gap between the LED array 10 and the back plate 60, and quickly conduct the heat generated by the LED array 10 to the back plate 60; in addition, the back plate 60 can diffuse the heat to the outside through its larger heat dissipation area, so as to avoid the brightness attenuation, color deviation or service life shortening of the LED array 10 caused by local heat accumulation, thereby ensuring the long-term stable light emission of the LED array 10 and further improving the working reliability and service life of the entire display device.

[0052] Optionally, a buffer pad is arranged between the front frame 50 and the light valve glass 20.

[0053] In the embodiment, the buffer pad can absorb the abutting pressure of the front frame 50 on the edge of the light valve glass 20, so as to avoid the rigid contact to cause the light valve glass 20 to be broken, edge collapsed or surface scratched, and protect the structural integrity thereof; in addition, the elastic property of the buffer pad can compensate for the slight size error of the front frame 50 and the light valve glass 20 during assembly, fill the gap therebetween, ensure the position of the light valve glass fixed in the accommodating cavity, and prevent the displacement caused by vibration or impact during use; at the same time, the buffer pad can also isolate the influence of external vibration on the light valve glass 20, ensure the accuracy of light path regulation, and improve the reliability and durability of the overall structure of the display device.

[0054] The embodiment of the application further provides a display device comprising the light path controllable display device.

[0055] The display device in the embodiment integrates the aforementioned light path controllable display device. When the display device starts the privacy mode, based on the control logic of the display device, the liquid crystal material 204 in the light valve control layer is driven to switch from the first state in which the short axis is parallel to the first light incidence direction to the second state in which the long axis is parallel to the first light incidence direction; at this time, the light is emitted in the form of direct light after being regulated by the light valve control layer, and only the front small-angle range can clearly obtain the display content, and the side cannot observe the effective information, so as to realize the privacy protection and be suitable for the use scene of preventing information leakage; when the privacy mode is exited, the liquid crystal material 204 can quickly return to the first state, and switch back to the large-viewing-angle display mode. The entire light path switching process is fast in response and convenient to operate, and does not need to add additional components, so that the flexible regulation of the light path is realized.

[0056] The embodiment of the present application also provides a communication device, comprising a signal receiving module, a position adjusting module and the above-mentioned light path controllable display device, wherein when the liquid crystal material is in the first state and the signal receiving module receives position information sent by a target source A, the position adjusting module adjusts the angle between the light path controllable display device and the target source A according to the position information, so that the light valve glass 20 is directed to the target source A, and the liquid crystal material is switched from the first state to the second state to send the light signal corresponding to the third light to the target source A.

[0057] The position information is the position information of the target source sent by the target source to the signal receiving module when the target source receives the light signal corresponding to the second light.

[0058] In the embodiment, as shown in the figure, Figure 5 When the liquid crystal material in the light valve glass 20 is in the first state, the second light output by the light valve glass is dispersed light (i.e. scattered light), and the dispersed light has a multi-angle propagation characteristic and can cover the surrounding area in the largest range, so as to ensure that the potential target source A can receive the light signal corresponding to the second light, thereby providing a wide coverage source searching basis for the preliminary establishment of the communication link. Figure 6 When the target source A receives the dispersed light signal, the target source A feeds back the position information of the target source to the signal receiving module of the communication device, at this time, the position adjusting module adjusts the angle between the light path controllable display device and the target source A according to the position information, so that the light valve glass 20 is directed to the target source A, and the liquid crystal material in the light valve glass 20 is switched from the first state to the second state to output the directional third light, and the third light is direct light. Since the third light has strong directivity, it can be accurately transmitted to the aligned target source A, thereby effectively avoiding that the light signal is monitored by the side irrelevant equipment, so as to flexibly switch to the directional private communication mode after completing the wide range source searching communication, and the coverage range and the privacy security of the communication are taken into account.

[0059] It should be noted that in this paper, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitation, the element defined by the statement "including a" does not exclude the existence of another same element in the process, method, article or device including the element.

[0060] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are merely illustrative, but not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection of the present application.

Claims

1. A display device with controllable optical path, characterized in that, include: A light-emitting diode (LED) array and a light valve glass are stacked together. The LED array emits a first light beam toward the light valve glass. The light valve glass includes a first glass layer, a light valve control layer, and a second glass layer stacked sequentially. The first glass layer is close to the LED array. The light valve control layer includes a prism structure and a liquid crystal material. The liquid crystal material has an elliptical structure, and the refractive index corresponding to the major axis of the liquid crystal material is different from the refractive index corresponding to the minor axis of the liquid crystal material. The refractive index corresponding to the major axis of the liquid crystal material is the same as the refractive index of the prism structure. When the liquid crystal material is in the first state, the first light ray passes through the first glass layer and enters the light valve control layer. Under the refraction of the prism structure and the liquid crystal material, the second light ray passes through the second glass layer and is emitted as scattered light. In the first state, the short axis of the liquid crystal material is parallel to the incident direction of the first light ray. When the liquid crystal material is in the second state, the first light ray passes through the first glass layer and enters the light valve control layer. Under the refraction of the prism structure and the liquid crystal material, the third light ray passes through the second glass layer and exits. Both the first light ray and the third light ray are direct light. In the second state, the long axis of the liquid crystal material is parallel to the incident direction of the first light ray.

2. The optically controllable display device according to claim 1, characterized in that, The light valve control layer further includes a first conductive layer and a second conductive layer. The prism structure and the liquid crystal material are disposed between the first conductive layer and the second conductive layer. The first conductive layer is disposed on the surface of the first glass layer near the liquid crystal material. The second conductive layer is disposed on the surface of the second glass layer near the prism structure. The prism structure is disposed on the surface of the second conductive layer near the liquid crystal material. The liquid crystal material is distributed between the first conductive layer and the prism structure. When electricity is applied to the first conductive layer and the second conductive layer, the electric field formed between the first conductive layer and the second conductive layer is used to switch the state of the liquid crystal material.

3. The optically controllable display device according to claim 2, characterized in that, Both the first conductive layer and the second conductive layer are indium tin oxide (ITO) layers.

4. The optically controllable display device according to claim 1, characterized in that, Also includes: A first compensation film and a second compensation film are provided, wherein the light valve glass is disposed between the first compensation film and the second compensation film, and the first compensation film is located on the surface of the first glass layer near the light-emitting diode array, and the second compensation film is located on the surface of the second glass layer away from the light valve glass.

5. The optically controllable display device according to claim 1, characterized in that, The light-emitting diode array includes a substrate and a plurality of light-emitting diodes arrayed on the substrate. Each light-emitting diode is provided with a lens structure located on the side of the light-emitting diode near the light valve glass. The lens structure is used to converge the light emitted by the light-emitting diode into the first light.

6. The optically controllable display device according to any one of claims 1 to 5, characterized in that, It also includes a front frame and a back plate, the front frame and the back plate cooperate to form a receiving cavity, the light-emitting diode array and the light valve glass are located in the receiving cavity, and the light-emitting diode array is disposed on the back plate, a part of the front frame abuts against the edge of the light valve glass, and another part of the front frame is connected to the back plate.

7. The optically controllable display device according to claim 6, characterized in that, Thermally conductive adhesive is provided between the LED array and the backplate.

8. The optically controllable display device according to claim 6, characterized in that, A buffer pad is provided between the front frame and the light valve glass.

9. A display device, characterized in that, The display device includes the optically controllable display device as described in any one of claims 1 to 8, wherein, when the display device activates a privacy mode, the liquid crystal material switches from the first state to the second state.

10. A communication device, characterized in that, The device includes a signal receiving module, a position adjustment module, and a light path controllable display device as described in any one of claims 1 to 8. When the liquid crystal material is in a first state, and the signal receiving module receives position information sent by a target source, the position adjustment module adjusts the angle between the light path controllable display device and the target source according to the position information, such that the light valve glass faces the target source, and the liquid crystal material switches from the first state to the second state to send a light signal corresponding to the third light ray to the target source. The location information refers to the location information of the target source sent by the target source to the signal receiving module when the target source receives the optical signal corresponding to the second ray.

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