A light path controllable display device, display equipment and communication equipment

Abstract

Embodiments of the present application provide a kind of light path controllable display device, display equipment and communication equipment, it is related to display technical field, light path controllable display device, including the light emitting diode array and light valve glass of laminated arrangement, light valve glass includes the first glass layer, light valve control layer and second glass layer of sequentially laminated arrangement, light valve control layer includes prism structure and liquid crystal material, liquid crystal material is elliptical structure, the refractive index corresponding to long axis of liquid crystal material and the refractive index corresponding to short axis of liquid crystal material are different, the refractive index corresponding to long axis of liquid crystal material and the refractive index of prism structure are identical.Through switching the arrangement direction of liquid crystal molecule, to change the refractive index relationship of liquid crystal material and prism structure, to control the propagation form of light, realizes the controllable adjustment of light path.Suitable for conventional display, privacy prevent peeping, directional communication and different scene, improve the applicability and flexibility of display device under the demand of various uses.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display device, display equipment, and communication equipment with controllable optical path. Background Technology

[0002] Micro LEDs are considered one of the core directions of next-generation display technology. They can achieve self-emissive displays using micrometer-scale (1 to 100 micrometers) LED chips as pixels, offering advantages such as high brightness, high contrast, low power consumption, and long lifespan. However, with the development of display technology, excellent display effects are no longer the only pursuit; requirements such as privacy protection and variability have gradually become hot topics.

[0003] Currently, to change the optical path of a display device, a privacy screen is usually added. This not only sacrifices the overall brightness but also makes it impossible to switch between different optical paths, resulting in poor flexibility. Summary of the Invention

[0004] This invention provides a display device, display equipment, and communication equipment with controllable optical path to solve the problem of poor flexibility in optical path control of existing display devices.

[0005] This invention provides a controllable optical path display device, comprising: a light-emitting diode array and a light valve glass, wherein the light-emitting diode array and the light valve glass are stacked together, the light-emitting diode array is used to emit a first light beam toward the light valve glass, and the light valve glass comprises a first glass layer, a light valve control layer and a second glass layer stacked sequentially, the first glass layer being close to the light-emitting diode array, and the light valve control layer comprising a prism structure and a liquid crystal material, the liquid crystal material having an elliptical structure, and the refractive index corresponding to the major axis of the liquid crystal material being 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 being the same as the refractive index of the prism structure;

[0006] 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.

[0007] 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.

[0008] Optionally, 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, and the prism structure is disposed on the surface of the second conductive layer near the liquid crystal material, and the liquid crystal material is distributed between the first conductive layer and the prism structure;

[0009] 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.

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

[0011] Optionally, it further includes: a first compensation film and a second compensation film, 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.

[0012] Optionally, 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.

[0013] Optionally, it also includes a front frame and a back plate, the front frame and the back plate cooperating to form a receiving cavity, the light-emitting diode array and the light valve glass being located in the receiving cavity, and the light-emitting diode array being disposed on the back plate, a portion of the front frame abutting against the edge of the light valve glass, and another portion of the front frame being connected to the back plate.

[0014] Optionally, thermally conductive adhesive is provided between the light-emitting diode array and the backplate.

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

[0016] This invention also provides a display device, including the above-described optically controllable display apparatus, wherein, when the display device activates a privacy mode, the liquid crystal material switches from the first state to the second state.

[0017] This invention also provides a communication device, including a signal receiving module, a position adjustment module, and the aforementioned optically controllable display device. When the liquid crystal material is in a first state, and the signal receiving module receives position information from a target source, the position adjustment module adjusts the angle between the optically controllable display device and the target source according to the position information, so 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 the light signal corresponding to the third light ray to the target source.

[0018] 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.

[0019] In this embodiment of the invention, a light-emitting diode array is stacked with a light valve glass as a light source, and optical path control is achieved 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, its refractive index differs from that of the prism structure, and the light is scattered after being refracted by the light valve control layer, suitable for wide-view conventional displays. When the liquid crystal material switches to the second state, its refractive index is the same as that of the prism structure, and the light is emitted directly without deflection, meeting the requirements for privacy protection or directional optical communication. Thus, by switching the alignment direction of the liquid crystal molecules, the refractive index relationship between the liquid crystal material and the prism structure is changed, thereby controlling the propagation pattern of the light and achieving controllable adjustment of the optical path. This is applicable to various scenarios such as conventional displays, privacy protection, and directional communication, improving the applicability and flexibility of display devices under diverse usage requirements. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is one of the structural schematic diagrams of the optically controllable display device provided in the embodiments of the present invention;

[0022] Figure 2 This is a second schematic diagram of the structure of the optically controllable display device provided in an embodiment of the present invention;

[0023] Figure 3 This is one of the schematic diagrams of the operation of the light valve glass in the optically controllable display device provided in the embodiments of the present invention;

[0024] Figure 4 This is the second schematic diagram of the operation of the light valve glass in the optically controllable display device provided in the embodiment of the present invention;

[0025] Figure 5 This is one of the schematic diagrams of the operation of the communication device provided in the embodiment of the present invention;

[0026] Figure 6 This is the second schematic diagram of the operation of the communication device provided in the embodiment of the present invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The terms "first," "second," etc., used in the specification and claims of this invention are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such usage can be interchanged where appropriate so that embodiments of the invention can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0029] like Figures 1 to 2 As shown, this embodiment of the invention provides a display device with controllable optical path, including: 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 together. The light-emitting diode array 10 is used to emit a first light beam toward the light valve glass 20. The light valve glass 20 includes a first glass layer 201, a light valve control layer and a second glass layer 202 stacked sequentially. The first glass layer 201 is close to the light-emitting diode array 10. The light valve control layer includes a prism structure 203 and a liquid crystal material 204. The liquid crystal material 204 has an elliptical structure, and the refractive index corresponding to the major axis of the liquid crystal material 204 is different from the refractive index corresponding to the minor axis of the liquid crystal material 204. The refractive index corresponding to the major 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 and enters the light valve control layer. Under the refraction of the prism structure 203 and the liquid crystal material 204, the second light passes through the second glass layer 202 and is scattered light. In the first state, the minor 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 ray passes through the first glass layer 201 and enters the light valve control layer. Under the refraction of the prism structure 203 and the liquid crystal material 204, the third light ray passes through the second glass layer 202 and is emitted. 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 204 is parallel to the incident direction of the first light ray.

[0032] In this design, a light-emitting diode array 10 is stacked with a light valve glass 20 as the light source, and optical path control is achieved through a light valve control layer in the light valve glass 20. A first glass layer 201 and a second glass layer 202 are located on opposite sides of the light valve control layer, serving as light conductors and providing support and protection. The light valve control layer, as the core layer for switching between different optical paths, may include a prism structure 203 and a liquid crystal material 204. The liquid crystal material 204 is designed with an elliptical structure and exhibits birefringence, with its refractive index along its major axis differing from that along its minor axis. Furthermore, its major axis refractive index is identical to that of the prism structure 203. For example, the refractive index along the major axis (denoted as n1) of the liquid crystal material 204 (denoted as n2) differs from that along its minor axis, and n1 is exactly equal to the refractive index of the prism structure (denoted as n0), i.e., n1 = n0, n2 ≠ n0. By applying or de-energizing the light valve glass 20, the liquid crystal material 204 can be switched between a first state and a second state, thereby changing the alignment direction of the liquid crystal molecules and thus altering the refractive index of the liquid crystal material 204. In this way, when light passes through a medium with the same refractive index, it will not be deflected; but when light passes through a medium with a different refractive index, it will be deflected, thus achieving switching between different optical paths.

[0033] In one example, the light valve glass 20 is not energized and has no electric field. The liquid crystal molecules are aligned according to the orientation film's constraint direction, meaning the short axis of the liquid crystal material 204 is parallel to the propagation direction of the first ray. 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), the light will be deflected at multiple angles due to the abrupt change in refractive index when passing through the interface between the liquid crystal material 204 and the prism structure 203. The deflected light is emitted through the second glass layer as scattered light (i.e., the second ray), forming a wide-angle optical path, such as... Figure 3 As shown, the second light can be received from different angles.

[0034] In another example, the light valve glass 20 is energized, forming an electric field that drives the liquid crystal molecules to rotate, meaning the long axis of the liquid crystal material 204 is parallel to the propagation direction of the first ray. 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), the light does not experience a sudden change in refractive index when passing through the interface between the liquid crystal material 204 and the prism structure 203, maintaining its original propagation direction without deflection. The undeflected light exits through the second glass layer as direct light (i.e., the third ray), forming a small-angle optical path, such as... Figure 4 As shown, the second light can only be received in the direction perpendicular to the light valve glass 20, which is suitable for privacy displays or directional light 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 optical path is controlled 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 incident direction of the first light ray), the refractive index of the liquid crystal material 204 is different from that of the prism structure 203. The light is refracted by the light valve control layer and emitted as scattered light (i.e., the second light ray), which is suitable for large-view conventional displays. When the liquid crystal material 204 switches to the second state (i.e., the long axis is parallel to the incident direction of the first light ray), the refractive index of the liquid crystal material 204 is the same as that of the prism structure 203. The light is emitted as direct light (i.e., the third light ray) without deflection, which meets the requirements of privacy protection 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 mode of the light and realizing the controllable adjustment of the optical path. It is suitable for various scenarios such as conventional display, privacy protection, and directional communication, improving the applicability and flexibility of display devices under diverse usage needs.

[0036] Optionally, the light valve control layer further includes a first conductive layer 205 and a second conductive layer 206. The prism structure 203 and the liquid crystal material 204 are disposed between the first conductive layer 205 and the second conductive layer 206. The first conductive layer 205 is disposed on the surface of the first glass layer 201 near the liquid crystal material 204. The second conductive layer 206 is disposed on the surface of the second glass layer 202 near the prism structure 203. The prism structure 203 is disposed on the surface of the second conductive layer 206 near the liquid crystal material 204. The liquid crystal material 204 is distributed between the first conductive layer 205 and the prism structure 203.

[0037] When the first conductive layer 205 and the second conductive layer 206 are energized, the 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 this embodiment, the light-emitting diode array 10 serves as a light source emitting light. Along the light propagation direction, the light valve control layer sequentially includes a first glass layer 201, a first conductive layer 205, a liquid crystal material 204, a prism structure 203, a second conductive layer 206, and a second glass layer 202. The first conductive layer 205 is in close contact with the inner surface of the first glass layer 201 (i.e., the side near the liquid crystal material 204) to serve as the lower electrode of the electric field, directly adjacent to the liquid crystal material 204. The second conductive layer 206 is in close contact with the inner surface of the second glass layer 202 (i.e., the side near 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 near the liquid crystal material 204. The liquid crystal material 204 fills the space between the first conductive layer 205 and the second conductive layer 206, ensuring that the liquid crystal material 204 is fully covered by the electric field formed by the conductive layers, thus ensuring the uniformity of state switching.

[0039] For example, before power is applied, the liquid crystal material 204 is aligned according to the orientation film constraint direction, that is, 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. The light is deflected due to the difference in refractive index between the liquid crystal and the prism, thus outputting scattered light. After power is applied, the electric field drives the liquid crystal molecules to rotate, changing their alignment from the short axis to the long axis. At this time, the state of the liquid crystal material 204 can be recorded as the second state. Since the refractive index of the liquid crystal and the prism is the same, the light is output as direct light without deflection. After power is de-energized, the liquid crystal molecules lose the electric field driving force 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 switched quickly through the electric field between the first conductive layer 205 and the second conductive layer 206, resulting in fast response speed and a thin and light structure.

[0040] In one example, the light valve glass 20 is not energized, and there is no electric field between the first conductive layer 205 and the second conductive layer 206. The liquid crystal molecules are aligned according to the orientation film constraint direction, that is, the short axis direction of the liquid crystal material 204 is parallel to the propagation direction of the first light ray. At this time, the refractive index of the liquid crystal short axis is different from that of the prism structure. 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 abrupt change in refractive index. The deflected light rays are scattered as second light rays and exit through the second glass layer, forming a wide-angle light path, such as... Figure 3 As shown, the second light can be received from different angles.

[0041] In another example, when the light valve glass 20 is energized, an electric field is formed between the first conductive layer 205 and the second conductive layer 206. This electric field drives the liquid crystal molecules to rotate, meaning the long axis of the liquid crystal material 204 is parallel to the propagation direction of the first light ray. At this time, the refractive index of the liquid crystal along its long axis is the same as that of the prism structure. When the light ray passes through the interface between the liquid crystal material 204 and the prism structure 203, there is no abrupt change in refractive index, maintaining its original propagation direction without deflection. The undeflected light ray still exits through the second glass layer as direct light (i.e., the third light ray), forming a small-angle light path, such as... Figure 4 As shown, the second light can only be received in the direction perpendicular to the light valve glass 20, which is suitable for privacy displays or directional light communication.

[0042] Optionally, both the first conductive layer 205 and the second conductive layer can be set as indium tin oxide (ITO) layers. The ITO layer has both 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 without obstruction and with low loss to enter the light valve control layer, avoiding the impact 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 area when energized, ensuring that the liquid crystal molecules synchronously and accurately switch to the first state (short axis aligned with incident light) or the second state (long axis aligned with incident light), avoiding local light path control 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 during long-term contact with components such as glass layers and liquid crystal materials, which can extend the service life of the device. Moreover, its ability to be made into an ultra-thin film will not increase the thickness and weight of the light valve glass, adapting to the design requirements of thinner and lighter display devices, and ultimately ensuring the reliability of light path switching and overall performance stability of the device in scenarios such as conventional display, privacy protection, and directional communication.

[0043] Optionally, it further includes: a first compensation film 30 and a second compensation film 40, wherein the light valve glass 20 is disposed between the first compensation film 30 and the second compensation film 40, and the first compensation film 30 is located on the surface of the first glass layer 201 near the light-emitting diode array 10, and the second compensation film 40 is located 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 near the light-emitting diode array 10, which can provide a stable incident light basis for the light entering the light valve glass 20 and reduce the influence of stray light between the light valve glass 20 and the light-emitting diode array 10. 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 screen reflection whitening. In this way, the display picture can maintain a clear, uniform and color true effect under different viewing angles and different lighting environments, thus improving the display effect of the display device.

[0045] Optionally, the light-emitting diode array 10 includes a substrate 101 and a plurality of light-emitting diodes 102 arrayed on the substrate 101. Each light-emitting diode 102 is provided with a lens structure 1021, which is located on the side of the light-emitting diode close to the light valve glass 20. 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 adhesive. The lens structure 1021 can converge and integrate the divergent light emitted by the light-emitting diode 102, converting it into a first light with more unified directionality and more concentrated energy. This ensures that the light can be efficiently and directionally directed onto the first glass layer 201 of the light valve glass 20, providing stable incident light conditions for the precise optical path control of the light valve control layer. This effectively avoids energy loss or reduced optical path control accuracy caused by excessive light divergence, and ensures the overall display or communication performance of the device.

[0047] The substrate 101 provides a support base for the array mounting of multiple light-emitting diodes 102, ensuring their stable arrangement to form a light-emitting diode array 10, and at the same time providing structural support and mounting positioning for the operation of the light-emitting diodes 102.

[0048] Optionally, it also includes a front frame 50 and a back plate 60, the front frame 50 and the back plate 60 cooperating to form a receiving cavity, the light-emitting diode array 10 and the light valve glass 20 being located in the receiving cavity, and the light-emitting diode array 10 being disposed on the back plate 60, a portion of the front frame 50 abutting against the edge of the light valve glass 20, and another portion of the front frame 50 being connected to the back plate 60.

[0049] In this embodiment, both the LED array 10 and the light valve glass 20 are disposed within the accommodating cavity for protection. The backplate 60 serves as a load-bearing base, providing a stable mounting support surface to ensure its fixed position. The front frame 50 achieves a dual function through structural adaptation. A portion of the front frame 50 tightly abuts against the edge of the light valve glass 20, limiting and fixing the light valve glass 20 to prevent displacement during use. The other portion of the front frame 50 is reliably connected to the backplate 60, stably constraining the core components such as the LED array 10 and the light valve glass 20 within the accommodating cavity. This ensures the accuracy of the stacked positions of each component to guarantee smooth light propagation, while also isolating external dust, impacts, and other interference, protecting the integrity and operational stability of the internal core structure.

[0050] Optionally, thermally conductive adhesive is provided between the light-emitting diode array 10 and the back plate 60.

[0051] In this embodiment, thermally conductive adhesive 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 during operation to the back plate 60. In addition, the back plate 60 can diffuse the heat to the outside through its larger heat dissipation area, avoiding brightness decay, color deviation or shortened lifespan of the LED array 10 due to local heat accumulation, thereby ensuring 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 provided between the front frame 50 and the light valve glass 20.

[0053] In this embodiment, the buffer pad can absorb the contact pressure between the front frame 50 and the edge of the light valve glass 20, avoiding rigid contact that could cause the light valve glass 20 to crack, chip, or have surface scratches, thus protecting its structural integrity. Furthermore, the elastic properties of the buffer pad can compensate for minor dimensional errors during the assembly of the front frame 50 and the light valve glass 20, filling the gap between them and ensuring that the light valve glass is fixed in position within the cavity, preventing displacement due to vibration or impact during use. At the same time, the buffer pad can also isolate the light valve glass 20 from external vibrations, ensuring the accuracy of optical path control and improving the overall reliability and durability of the display device.

[0054] This invention also provides a display device, including the above-described optically controllable display apparatus, wherein, when the display device activates a privacy mode, the liquid crystal material switches from the first state to the second state.

[0055] This embodiment of a display device integrates the aforementioned optically controllable display device. When the display device activates 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 a first state where the short axis is parallel to the incident direction of the first light ray to a second state where the long axis is parallel to the incident direction of the first light ray. At this time, the light is emitted in the form of direct light after being regulated by the light valve control layer, and the display content can only be clearly obtained within a small angle range on the front. Effective information cannot be observed from the side, thereby achieving privacy protection and being suitable for use scenarios that prevent information leakage. When exiting privacy mode, the liquid crystal material 204 can quickly return to the first state and switch back to the wide viewing angle display mode. The entire optical path switching process is responsive, convenient to operate, and requires no additional components, realizing flexible control of the optical path.

[0056] This invention also provides a communication device, including a signal receiving module, a position adjustment module, and the aforementioned optically controllable display device. When the liquid crystal material is in a first state, and the signal receiving module receives position information sent by a target source A, the position adjustment module adjusts the angle between the optically controllable display device and the target source A according to the position information, so that the light valve glass 20 faces the target source A, and the liquid crystal material switches from the first state to the second state to send the light signal corresponding to the third light ray to the target source A.

[0057] The location information refers to the location information of the target source that is sent by the target source to the signal receiving module when the target source A receives the optical signal corresponding to the second ray.

[0058] In this embodiment, as Figure 5 As shown, when the liquid crystal material in the light valve glass 20 is in the first state, the second light emitted by the light valve glass is diffused light (i.e., scattered light). Diffuse light has multi-angle propagation characteristics, enabling it to cover the surrounding area to the maximum extent, ensuring that potential target source A can receive the light signal corresponding to the second light, thus providing a broad-coverage source-finding foundation for the initial establishment of the communication link; as... Figure 6 As shown, when target source A receives the diffused light signal, it feeds back its position information to the signal receiving module of the communication device. At this time, the position adjustment module adjusts the angle between the controllable optical path display device and target source A based on this position information, causing the light valve glass 20 to face target source A. Simultaneously, the liquid crystal material in the light valve glass 20 switches from a first state to a second state, outputting a directional third light beam, which is direct light. Because the third light beam has extremely strong directionality, it can be accurately transmitted to the aligned target source A, effectively preventing the light signal from being eavesdropped on by unrelated devices. Therefore, after completing a wide-range source-finding communication, it can flexibly switch to a directional privacy communication mode, balancing the breadth of communication coverage and privacy security.

[0059] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0060] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A communication device, characterized in that, It includes a signal receiving module, a position adjustment module, and a display device with a controllable optical path. The optically controllable display device includes: a light-emitting diode array and a light valve glass, wherein the light-emitting diode array and the light valve glass are stacked together, the light-emitting diode array is used to emit a first light beam toward the light valve glass, and 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 being close to the light-emitting diode array, and the light valve control layer including a prism structure and a liquid crystal material, the liquid crystal material having an elliptical structure, and the refractive index corresponding to the major axis of the liquid crystal material being 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 being 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 is emitted. 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. When the liquid crystal material is in the first state, and the signal receiving module receives the position information sent by the 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, so 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 the light signal corresponding to the third light 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.

2. The communication 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 communication 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 communication 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 communication 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 communication 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 communication device according to claim 6, characterized in that, Thermally conductive adhesive is provided between the LED array and the backplate.

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

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