An audio-visual system may include a housing comprising an open upper end and a storage space, an audio-visual device installed inside the housing and exposable through the open upper end, and a lifting device configured to expose or store the audio-visual device inside the housing through the open upper end. The audio-visual device may include a display, a speaker, and a processor configured to control the audio-visual system to operate in a first mode for outputting media art content while the display is stored in the housing according to a first event, operate in a second mode for outputting audio content through the speaker while part of the display is exposed through the open upper end according to a second event, and operate in a third mode for outputting a visual content while the entire display is exposed through the open upper end according to a third event.

The image display device includes an image generating unit that emits first image light, a pupil expanding element that expands a diameter of a light flux included in the first image light from the image generating unit to obtain second image light, a first light condensing optical system that condenses the second image light and forms an intermediate image, and a second light condensing optical system that condenses light from the intermediate image and generates a virtual image on eye of a viewer, in a plane including at least the image generating unit, the pupil expanding element, and the eye of the viewer, a maximum emission angle of the first image light is smaller than a maximum viewing angle of the virtual image, and the diameter of the light flux included in the second image light is greater than that of a light flux included in the virtual image.

The image display device includes an image generating unit that emits first image light, a pupil expanding element that expands a diameter of a light flux included in the first image light from the image generating unit to obtain second image light, a first light condensing optical system that condenses the second image light and forms an intermediate image, and a second light condensing optical system that condenses light from the intermediate image and generates a virtual image on eye of a viewer, in a plane including at least the image generating unit, the pupil expanding element, and the eye of the viewer, a maximum emission angle of the first image light is smaller than a maximum viewing angle of the virtual image, and the diameter of the light flux included in the second image light is greater than that of a light flux included in the virtual image.

A display device is a display device 1 that includes a display unit main body that displays a video, two struts each of which has one end installed in the display unit main body, and a base on which both of the other ends of the two struts are installed, and includes a reversed installation prevention unit that prevents the two struts from being reversely installed in the display unit main body and the base, in which the two struts are formed by folding metal plates, which have the same shape, in opposite directions with respect to front and back sides and providing column shapes having different shapes with fold line directions as longitudinal directions.

A display device is a display device 1 that includes a display unit main body that displays a video, two struts each of which has one end installed in the display unit main body, and a base on which both of the other ends of the two struts are installed, and includes a reversed installation prevention unit that prevents the two struts from being reversely installed in the display unit main body and the base, in which the two struts are formed by folding metal plates, which have the same shape, in opposite directions with respect to front and back sides and providing column shapes having different shapes with fold line directions as longitudinal directions.

Disclosed is a display device including, from a front face towards a rear face, a panel, a ground plane, and a processing unit connected to the panel and including an antenna for receiving and/or emitting a wave for connection to a wireless network. The display device further includes a plurality of adjustable elements connected to the processing unit, each adjustable element having an impedance which can be modified by the processing unit in order to change the manner in which the wave is reflected and/or transmitted by the adjustable elements, these adjustable elements being located on the rear side of the ground plane.

Disclosed is a display device including, from a front face towards a rear face, a panel, a ground plane, and a processing unit connected to the panel and including an antenna for receiving and/or emitting a wave for connection to a wireless network. The display device further includes a plurality of adjustable elements connected to the processing unit, each adjustable element having an impedance which can be modified by the processing unit in order to change the manner in which the wave is reflected and/or transmitted by the adjustable elements, these adjustable elements being located on the rear side of the ground plane.

Disclosed is a curved-surface television wall mount, including a wall panel (1) mounted on a wall surface, and two television mounting plates (2) disposed on the wall panel (1) for mounting a television. The curved-surface television wall mount further includes two supports (3) disposed on the wall panel (1), and the backs of the two television mounting plates (2) are respectively connected by hinges to the two supports (3). When a curved-surface television is mounted by using this structure, the front sides of the television mounting plates can fit to the back of the curved-surface television, thus avoiding deviation, instability or looseness when tightening a fastener, and successfully mounting the curved-surface television.

Disclosed is a curved-surface television wall mount, including a wall panel (1) mounted on a wall surface, and two television mounting plates (2) disposed on the wall panel (1) for mounting a television. The curved-surface television wall mount further includes two supports (3) disposed on the wall panel (1), and the backs of the two television mounting plates (2) are respectively connected by hinges to the two supports (3). When a curved-surface television is mounted by using this structure, the front sides of the television mounting plates can fit to the back of the curved-surface television, thus avoiding deviation, instability or looseness when tightening a fastener, and successfully mounting the curved-surface television.

An audio-visual system may include a housing comprising an open upper end and a storage space, an audio-visual device installed inside the housing and exposable through the open upper end, and a lifting device configured to expose or store the audio-visual device inside the housing through the open upper end. The audio-visual device may include a display, a speaker, and a processor configured to control the audio-visual system to operate in a first mode for outputting media art content while the display is stored in the housing according to a first event, operate in a second mode for outputting audio content through the speaker while part of the display is exposed through the open upper end according to a second event, and operate in a third mode for outputting a visual content while the entire display is exposed through the open upper end according to a third event.