A modular photograph display system is provided. The display system can include one of more modular illuminated photograph display assemblies including a frame, base, and a post therebetween. The frame can include a frame back, illumination panel, photograph matte, window, clip assemblies, and cover. The clip assemblies can secure the window and matte against the frame back, such that a photograph can be inserted therebetween, and can magnetically secure the cover to the frame back. The base can include an LED driver and a controller for controlling one or more illumination panels. The bases of two or more modular photograph display assemblies can be coupled together to form an assembly of display assemblies. Additional frames and posts can added on top of the frames of the modular display assemblies to further increase the number of photographs that can be displayed.

This lighting device (1) is provided with a first light source (L1) and a second light source (L2). The first light source (L1) emits a first light. The second light source (L2) emits a second light. The first light and the second light have substantially the same color temperature but different spectral characteristics. This lighting device (1) is configured such that the first light and the second light are alternately irradiated onto a road sign (2).

A light emitting device includes a cover panel including a plurality of light emitting regions and a light source disposed on a surface of the cover panel to be adjacent to the plurality of light emitting regions. An optical portion is configured to emit light generated by the light source through the plurality of light emitting regions. A controller is configured to independently determine what light is emitted through each of the plurality of light emitting regions independently.

An electronic signage assembly for creating and wirelessly posting messages to a display unit includes a display unit comprising a display transceiver and a control unit comprising a remote transceiver, so that the control unit is positioned for wireless communication with the display unit. The display unit also comprises a display screen. The control unit comprises an entry module, which allows for entry of a message. The remote transceiver is positioned to communicate the message, via the display transceiver, to the display screen for display of the message to persons proximate to the display unit.

A drone propulsion unit includes a propeller with a hub and a plurality of blades, an electric motor with a motor support, and a motor control device, wherein the electric motor includes a fixed part with a stator connected to the motor support and a mobile part with a rotor mobile about an axis of rotation for driving the propeller, the propeller includes a blade with a plurality of electroluminescent diodes and a diode control device, the motor includes a hollow central shaft, and the motor support includes a communication device adapted to communicate with a communication device integrated in the propeller, with the communication devices being positioned on either side of the hollow shaft.

An LED control system is provided for connection to an LED lighting system via a power line to control the LED lighting system using commands formed by manipulation of frequency and amplitude of a signal transmitted over the power line. The signal may be for example a wave or a sequence of pulses. The signal may be provided in superposition with line power or the line power may be formed as the signal.

An illuminated sign for providing a warning that an area adjacent the illuminated sign is within a field of view of an audio/video (A/V) recording and communication device. The illuminated sign may include a front panel having translucent portions and opaque portions, and an illumination source located behind the front panel. The illumination source illuminates the front panel such that the opaque portions block transmission through the front panel of at least a portion of the light from the illumination source to provide the warning that the area adjacent the illuminated sign is within the field of view of the A/V recording and communication device.

A light-emitting sign device according to the present invention comprises: a solar cell; a battery module comprising at least one battery in which power generated by the solar cell is stored; a light-emitting module for emitting light by the power supplied from the battery; a front panel optically coupled to the light-emitting module; and a controller for applying, to the light-emitting module, a target mode determined, from among driving modes, on the basis of an average value of solar cell voltages measured for a certain period with respect to the solar cell and a voltage value of a battery voltage measured at a certain time with respect to the battery module.

A billboard or other large display for displaying information has a billboard frame, an artwork layer, and either a plurality of columns of LED light plates or vertical strips of LED lights. The LED plates are small backlight panels formed in an array covering large areas suitable for standard billboards. The LED plates are secured to one another to hang from the billboard frame in separate columns. The columns are situated between the artwork layer and the billboard frame to provide a backlight for the artwork layer. The artwork layer can include two or more layers such that different artwork is displayed depending on the ambient lighting conditions as well as the backlight operation. The LEDs are preferably controlled by a controller to provide desired backlight conditions as well as to display content.

A guide display device which is installed in a predetermined direction includes: a first screen which is parallel to the predetermined direction; a first light source which illuminates the first screen; a cover which is provided above the first screen in the predetermined direction and projects in a direction crossing the first screen to block light from above the guide display device and cast a shadow upon an area of the guide display device; a second light source which illuminates the area on which the shadow cast; and a controller which causes at least the second light source to perform optical communication.