Abstract: Disclosed is a display device including a cover plate, a display panel, a first circuit board, and a rear housing, wherein the cover plate is connected to the rear housing to form an accommodation space, the display panel is assembled with the first circuit board and is disposed in the accommodation space, and the first circuit board includes a first extension portion and a second extension portion, wherein the first extension portion and the second extension portion are connected, the first extension portion extends in a first direction and is attached to the display panel, and the second extension portion extends in a second direction and is attached to the display panel, the first direction being intersected with the second direction.

Abstract: An electronic door plate and a system for managing an electronic door plate. The electronic door plate particularly includes: a center frame, a circuit board, a display screen, a back cover and an alarming device; the circuit board, the display screen and the alarming device are fixed to the center frame; the back cover is provided on one side of the center frame that is further away from the display screen, and is fixedly connected to the center frame; a controlling module is provided at the circuit board, and the controlling module is electrically connected to the alarming device; and the controlling module is configured for controlling the alarming device to perform an alarming operation.

Abstract: A differentiated real-time injection-production optimization adjustment method of an intelligent injection-production linkage device belongs to the field of oil reservoir injection-production technologies.