Abstract: The application belongs to the technical field of LED display screen box assembly, and relates to a tension lock and LED display screen box. The tension lock comprises a base, a rotating shaft, a shim and a knob, wherein the base is provided with a sliding hole, one end of the rotating shaft is fixedly connected with the knob, the other end of the rotating shaft is inserted into the sliding hole, the shim is rotationally connected with the rotating shaft, and the distance between the shim and the knob is kept constant; Turning the knob can make the rotating shaft rotate and slide along the axial direction of the sliding hole to make the shim move away from or close to the base. The tension lock can effectively improve the installation efficiency of LED display screen box.

Abstract: The present invention discloses a precise etching apparatus for preparing a recessed-gate enhancement device and an etching method for the same. The apparatus provided by the present invention includes an inductively-coupled plasma etching chamber, a current detection device, an inductive coil, a radio frequency source, a mechanical pump, and a molecular pump. The current detection device is connected with the inductively-coupled plasma etching chamber. The inductive coil is connected with the inductively-coupled plasma etching chamber. The radio frequency source is connected with the inductive coil. The mechanical pump and the molecular pump are connected with the inductively-coupled plasma etching chamber.

Abstract: A UV-curable and recyclable thermoset shape memory polymer is provided. The polymer includes a vitrimer-based monomer and a photoinitiator. The vitrimer-based monomer includes a first unit rendering a high chain stiffness upon polymerization of the monomer, and a second photopolymerizable unit for photopolymerization of the monomer under a UV irradiation. The polymer has high strength, high stiffness, high recovery stress, high energy storage, reasonable recycling efficiency, and is printable using SLA with high resolution.

Abstract: Provided is an LED display screen, comprising an LED display unit, a box frame arranged at two outer ends of the unit, a power control box fixedly connected to the unit and a curved surface adjustment device. The unit includes a front body, a rear body, a bendable flexible lamp panel and an elastic stop piece; The front body covers one side of the lamp panel provided with LED lamps, and the rear body includes a plurality of rear body units, each is fixedly connected to one side of the lamp panel facing away from the LED lamps, and adjacent rear body units are arranged at intervals; The elastic stop piece is positioned between the lamp panel and rear body; one end of the curved surface adjustment device is fixedly connected to the box frame and another end is fixedly connected to the power control box.

Abstract: Provided is an anti-collision device for LED screen, comprising a box body (1), a telescopic rotating mechanism, an anti-collision sheet (4) and a display module (2); the peripheral side of the box body (1) is provided with a mounting hole (12) and a receiving groove (11); the telescopic rotating mechanism is embedded in the mounting hole (12) and movably connected with the box body (1); the anti-collision sheet (4) is fixedly connected with the telescopic rotating mechanism. When the telescopic rotating mechanism is not subjected to external force, the telescopic rotating mechanism enables the anti-collision sheet (4) to shield the peripheral side of the display module (2) outside the receiving groove (11); when the telescopic rotating mechanism is subjected to external force, the telescopic rotating mechanism drives the anti-collision sheet (4) to retract and rotate to be embedded in the receiving groove (11).

Abstract: A GaN-HEMT device with a sandwich structure and a method for preparing the same are provided. The GaN-HEMT device includes an epitaxial layer and electrodes, wherein the epitaxial layer includes a GaN channel layer (2) and an AlyGa1-y barrier layer (1), and is arranged from top to bottom; the electrodes include a gate electrode (6), a source electrode (7), a drain electrode (5) and a field plate electrode (10), wherein the field plate electrode (10) and the gate electrode (6) are respectively fabricated on an upper surface and a lower surface of the epitaxial layer, and the field plate electrode (10) extends to a region beyond the epitaxial layer and is connected with the gate electrode (6) to form the sandwich structure, and the source electrode (7) and the drain electrode (5) are respectively located at two ends of the epitaxial layer.

Abstract: An image generation method is provided. The image generation method includes the steps of acquiring a planimetric taken input image, and segmenting the planimetric taken input image into a plurality of planimetric image regions; acquiring a region exposure time point of each planimetric image region and a lens attitude of a corresponding taking lens at the region exposure time point; correcting a planimetric position coordinate of each planimetric image region according to the lens attitude of the taking lens at the region exposure time point and a lens attitude of the taking lens at an intermediate time point of image exposure; and generating a planimetric taken output image based on the corrected planimetric position coordinates of the planimetric image regions.

Abstract: Provided is an LED Screen, comprising a box frame and a display unit fixed in the box frame, wherein the display unit comprises a PCB board and a plurality of LED lamp beads fixed on the PCB board, the front and back of the display unit are covered with transparent waterproof membranes, which can play a waterproof role and avoid short circuit of the display unit; Waterproof membranes can also play a role in protecting the LED lamp beads and PCB board, preventing external objects from damaging the beads, and the PCB board from being corroded. Transparent waterproof membrane is easier for the light emitted from LED Lamp beads to pass through, so the PCB board installed with LED lamp beads and covered with waterproof membranes can be directly fixed on the box frame, and can be used, the PCB board can be directly maintained, which is simple and convenient.

Abstract: Provided is a curved surface adjustment device comprising an angle rotating assembly and a locking assembly, wherein the angle rotating assembly comprises a middle plate and a housing, the housing comprises a first mounting portion and a receptacle, the middle plate comprises a second mounting portion and an arc-shaped sliding portion; the locking assembly comprises a locking mechanism, when the locking mechanism is in a locking state, the arc-shaped sliding portion is locked in the arc-shaped sliding groove of the receptacle, when in an unlocking state, the arc-shaped sliding portion slides relative to the arc-shaped sliding groove of the receptacle, to adjust the included angle between the first mounting portion and the second mounting portion, thereby adjusting the curved surface radian of the LED display screen. The LED display screen adjusted by the present invention has better curved surface smoothness and smaller curved surface radius, provides more excellent display effect.

Abstract: The present invention discloses a method for preparing a GaN rectifier suitable for operating at an alternating current frequency of 35 GHz: sequentially growing, on a silicon substrate, an N-polar GaN buffer layer, a carbon doped semi-insulated N-polar GaN layer, a non-doped N-polar AlGaN layer, a non-doped N-polar GaN layer and a non-doped N-polar InGaN thin film to obtain a rectifier epitaxial wafer; preparing a pattern groove for a schottky contact electrode on the GaN rectifier epitaxial wafer, and depositing the schottky contact electrode in the groove; preparing a pattern for an ohmic contact electrode, and depositing a device ohmic contact electrode on the surface of the epitaxial wafer; subsequently, depositing a silicon nitride passivation layer at a part where there is no electrode on the surface of the epitaxial wafer, and preparing a surface electrode area; and finally, performing mesa isolation treatment on the GaN rectifier epitaxial wafer.

Abstract: An application download method for a download-to-start application includes obtaining, by a server, runtime information of an application from a large quantity of terminals that have downloaded and used the application, performing data analysis on the information, determining a sequence of application files based on a result of the data analysis, to arrange an application file with a high access probability in front of an application file with a low access probability, and transmitting the application files to a terminal device based on the sequence.

Abstract: A method and apparatus for copper-catalyzed electrochemical water treatment are provided. The method comprises the steps of supplying an aqueous solution and electrochemically treating the aqueous solution in an electrochemical cell comprising an anode, a cathode, and the aqueous solution as an electrolyte, by applying an electric potential to said anode and said cathode, thereby producing purified water. The apparatus comprises an electrochemical cell comprising an anode, a cathode, and an electrolyte, the electrolyte contacting the anode and the cathode; an inlet allowing the electrolyte in the electrochemical cell; and an outlet allowing purified water out of the electrochemical cell. In both cases, the electrolyte/aqueous solution comprises water to be treated, chloride ions in a concentration [Cl?] at least about 10 mM, and copper(II) and/or copper(I) ions in a total copper ions concentration, [CU2+] +[Cu+], of at least about 20 ?M.

Abstract: Disclosed herein, in accordance with some aspects of the present disclosure, are adaptive harmonic diffractive liquid crystal lenses and methods of making and use thereof.

Abstract: Provided is a corner protection device, comprising a slide rail shaft, a corner protection and detent mechanism, and a corner protector. The slide rail shaft is fixed on the LED display screen cabinet, the corner protection and detent mechanism is fixed on the sidewall at the top of the cabinet, and the corner protector is slidably disposed on the slide rail shaft. When the corner protector slides to the top of the cabinet, the corner protection and detent mechanism can fix the corner protector on the top of the cabinet so as to protect it. Also provided is an LED display screen cabinet, comprising the corner protection device mentioned above, and a support piece arranged on the sidewall of the cabinet. When the corner protector is fixed on the top of the cabinet, the support piece and corner protector can jointly support the display screen cabinet on the support platform.

Abstract: The application provides a floor tile screen, comprising a box body (1), a rear body (2), a PCB board (3) and a front body (4), wherein the rear body (2) is fixed on the box body (1); the PCB (3) is arranged between the rear body (2) and the front body (4), and provided with lamp beads; a plurality of transparent fixing columns (41) are fixedly arranged on the front body (4), pass through the PCB board (3), fixedly connected with the rear body (2), and avoid the lamp beads. The fixing column (41) has the function of limiting the front body (4), the front body (4) and the rear body (2) are connected together by fixing columns (41), to avoid separation; the fixing columns (41) are transparent, so that the light emitted by the lamp beads is not blocked, the display effect of the floor tile screen is improved.

Abstract: Provided is an LED display unit, comprising a front body, a lamp plate and a rear body, wherein the lamp plate is bendable and flexible, and the rear body comprises a plurality of rear body units, the front body is covered on one side of the lamp plate provided with LED lamps, each rear body unit is fixedly connected to a side of the lamp plate facing away from the LED lamps, and adjacent rear body units are arranged at intervals; by adopting the bendable and flexible lamp plate, every single LED display unit can be directly adjusted into a curved surface or any curved surface shape; a plurality of rear body units are fixed on the lamp plate, and gaps exist between the rear body units, which is beneficial to releasing bending stress and preventing the rear body from breaking during bending.

Abstract: Provided is a LED display box transport cart comprising: a transport frame and wheels, the transport frame comprises a chassis, an upper cover and two side covers symmetrically arranged between chassis and upper cover; chassis is provided with an arcuate groove with an upward opening, the first edge of arcuate groove extends to second edge to form a groove edge; the lower end of side cover corresponding to the position of arcuate groove is provided with a hook, circular arc plate of hook is rotatably connected in arcuate groove, the lower edge of rectangular plate is fixedly connected on second straight edge of circular arc plate, the arcuate edge is in sliding contact with inner wall of groove body of arcuate groove, the first straight edge of circular arc plate can abut against lower surface of groove edge; the upper end of side cover is detachably connected with upper cover.

Abstract: Provided is an LED display screen, comprising an LED display unit, a box frame arranged at two outer ends of the unit, a power control box fixedly connected to the unit and a curved surface adjustment device. The unit includes a front body, a rear body, a bendable flexible lamp panel and an elastic stop piece; The front body covers one side of the lamp panel provided with LED lamps, and the rear body includes a plurality of rear body units, each is fixedly connected to one side of the lamp panel facing away from the LED lamps, and adjacent rear body units are arranged at intervals; The elastic stop piece is positioned between the lamp panel and rear body; one end of the curved surface adjustment device is fixedly connected to the box frame and another end is fixedly connected to the power control box.

Abstract: Provided is a LED display box transport cart comprising: a transport frame and wheels, the transport frame comprises a chassis, an upper cover and two side covers symmetrically arranged between chassis and upper cover; chassis is provided with an arcuate groove with an upward opening, the first edge of arcuate groove extends to second edge to form a groove edge; the lower end of side cover corresponding to the position of arcuate groove is provided with a hook, circular arc plate of hook is rotatably connected in arcuate groove, the lower edge of rectangular plate is fixedly connected on second straight edge of circular arc plate, the arcuate edge is in sliding contact with inner wall of groove body of arcuate groove, the first straight edge of circular arc plate can abut against lower surface of groove edge; the upper end of side cover is detachably connected with upper cover.

Abstract: Provided is an anti-impact LED display screen, comprising a box body (1), a module (2), a protective mechanism (3), a first resilient assembly (4), a second resilient assembly (5) and a limit member (6). The protective mechanism (3) comprises a movable base (31) and a corner armor (32).