Abstract: The invention discloses a powder leakage monitoring device and a powder leakage monitoring method. The powder leakage monitoring device comprises light field camera, 3D PTZ (3-Dimensional Pan/Tilt/Zoom) and computer. Wherein, the light field camera records original light field images of monitored area; the 3D PTZ under the light field camera adjusts the shooting angle of the light field camera when it rotates according to the set direction; and the computer respectively connects to the light field camera and the 3D PTZ, which generates refocused images corresponding to the original light field images, and determines the spatial coordinates of the powder leakage point and the hazard range of the powder leakage in the monitored area according to the refocused images and the shooting angle. Therefore, the range and accuracy of powder leakage monitoring are both increased by using this invention.

Abstract: Disclosed is an electroluminescent display panel and a display device, and relates to the field of display technologies. The display region comprises a photosensitive device arranging region, a camera or fingerprint recognition device is arranged in the photosensitive device arranging region, rather than in the frame, and thus a relatively larger area occupying in the frame is avoided, to allow the frame be made narrower, and the screen-to-body ratio be increased. Also for the photosensitive device arranging region, the first signal lines and the second signal lines are arranged more intensively by arranging overlap areas in the orthographic projection of one first pixel on the base substrate, to allow the display panel have more concentrated space as the light-transmission region, so that the light transmittance of the photosensitive device arranging region can be increased to provide more lights to the camera or fingerprint recognition device.

Abstract: The present disclosure provides an ultraviolet LED epitaxial production method and an ultraviolet LED, where the method includes: pre-introducing a metal source and a group-V reactant on a substrate, to form a buffer layer through decomposition at a first temperature; growing an N-doped AlwGa1-wN layer on the buffer layer at a second temperature; growing a multi-section LED structure on the N-doped AlwGa1-wN layer at a third temperature, wherein a number of sections of the multi-section LED structure is in a range of 2 to 50; and each section of the LED structure comprises an AlxGa1-xN/AlyGa1-yN multi-quantum well structure and a P-doped AlmGa1-mN layer, and the multi-section LED structure emits light of one or more wavelengths, which realizes that a single ultraviolet LED emits ultraviolet light of different wavelengths, thereby improving the luminous efficiency of the ultraviolet LED.

Abstract: The present disclosure discloses a driving method and driving device of a display panel and a display device. Under the partial display mode, different gamma curves may be called for different display regions, to drive different regions of the same picture. In one embodiment, a first gamma curve with relatively low brightness may be called for a first display region provided with an under screen sensor, that is, the first display region is driven by the first gamma curve with the relatively low brightness. A second gamma curve with relatively high brightness may be called for a second display region in normal display, that is, the second display region is driven by the second gamma curve with the relatively high brightness.

Abstract: Disclosed is an electroluminescent display panel and a display device, and relates to the field of display technologies. The display region comprises a photosensitive device arranging region, a camera or fingerprint recognition device is arranged in the photosensitive device arranging region, rather than in the frame, and thus a relatively larger area occupying in the frame is avoided, to allow the frame be made narrower, and the screen-to-body ratio be increased. Also for the photosensitive device arranging region, the first signal lines and the second signal lines are arranged more intensively by arranging overlap areas in the orthographic projection of one first pixel on the base substrate, to allow the display panel have more concentrated space as the light-transmission region, so that the light transmittance of the photosensitive device arranging region can be increased to provide more lights to the camera or fingerprint recognition device.

Abstract: Disclosed is an electroluminescent display panel and a display device, and relates to the field of display technologies. The display region comprises a photosensitive device arranging region, a camera or fingerprint recognition device is arranged in the photosensitive device arranging region, rather than in the frame, and thus a relatively larger area occupying in the frame is avoided, to allow the frame be made narrower, and the screen-to-body ratio be increased. Also for the photosensitive device arranging region, the first signal lines and the second signal lines are arranged more intensively by arranging a plurality of overlap areas in the orthographic projection of one first pixel on the base substrate, to allow the display panel have more concentrated space as the light-transmission region, so that the light transmittance of the photosensitive device arranging region can be increased to provide more lights to the camera or fingerprint recognition device.

Abstract: The present disclosure provides an ultraviolet LED epitaxial production method and an ultraviolet LED, where the method includes: pre-introducing a metal source and a group-V reactant on a substrate, to form a buffer layer through decomposition at a first temperature; growing an N-doped AlwGa1-wN layer on the buffer layer at a second temperature; growing a multi-section LED structure on the N-doped AlwGa1-wN layer at a third temperature, wherein a number of sections of the multi-section LED structure is in a range of 2 to 50; and each section of the LED structure comprises an AlxGa1-xN/AlyGa1-yN multi-quantum well structure and a P-doped AlmGa1-mN layer, and the multi-section LED structure emits light of one or more wavelengths, which realizes that a single ultraviolet LED emits ultraviolet light of different wavelengths, thereby improving the luminous efficiency of the ultraviolet LED.

Abstract: The present disclosure discloses a driving method and driving device of a display panel and a display device. Under the partial display mode, different gamma curves may be called for different display regions, to drive different regions of the same picture. In one embodiment, a first gamma curve with relatively low brightness may be called for a first display region provided with an under screen sensor, that is, the first display region is driven by the first gamma curve with the relatively low brightness. A second gamma curve with relatively high brightness may be called for a second display region in normal display, that is, the second display region is driven by the second gamma curve with the relatively high brightness.

Abstract: Disclosed is an electroluminescent display panel and a display device, and relates to the field of display technologies. The display region comprises a photosensitive device arranging region, a camera or fingerprint recognition device is arranged in the photosensitive device arranging region, rather than in the frame, and thus a relatively larger area occupying in the frame is avoided, to allow the frame be made narrower, and the screen-to-body ratio be increased. Also for the photosensitive device arranging region, the first signal lines and the second signal lines are arranged more intensively by arranging a plurality of overlap areas in the orthographic projection of one first pixel on the base substrate, to allow the display panel have more concentrated space as the light-transmission region, so that the light transmittance of the photosensitive device arranging region can be increased to provide more lights to the camera or fingerprint recognition device.

Abstract: The present invention provides a method for fast protection switching in multicast, where the method includes: determining a primary path and a secondary path to a source node, where the secondary path and the primary path have minimum tail coincidence; receiving, by using both the primary path and the secondary path, multicast traffic replicated by an upstream neighboring node, and replicating multicast traffic received by the primary path to a downstream neighboring node; and if the primary path is faulty, replicating multicast traffic received by the secondary path to the downstream neighboring node. In the present invention, primary and secondary paths can have minimum tail coincidence, which overcomes a problem that fault protection switching in a multicast network requires that primary and secondary paths existing from a routing node to a multicast source are completely separate in physical topology.

Abstract: The present invention provides a method for fast protection switching in multicast, where the method includes: determining a primary path and a secondary path to a source node, where the secondary path and the primary path have minimum tail coincidence; receiving, by using both the primary path and the secondary path, multicast traffic replicated by an upstream neighboring node, and replicating multicast traffic received by the primary path to a downstream neighboring node; and if the primary path is faulty, replicating multicast traffic received by the secondary path to the downstream neighboring node. In the present invention, primary and secondary paths can have minimum tail coincidence, which overcomes a problem that fault protection switching in a multicast network requires that primary and secondary paths existing from a routing node to a multicast source are completely separate in physical topology.