A back-lit screen comprising: a rigid frame extending around the periphery of the screen and having a front face, the front face having an interior face which defines an opening, and an outer face which defines the exterior contour of the frame transversely to the opening; and a translucent sheet extending across the opening; the frame being configured so that over at least a part of the periphery of the screen the forward-most part of the interior face is coincident with the exterior contour of the frame.

Provided are a display device and an electronic device that can suppress complication of an internal structure and facilitate effective reduction in an amount of processed data in consideration of human vision in a display region. A display device includes a display unit having a display region in which a plurality of pixel columns is arranged. Each of the plurality of pixel columns has a plurality of pixels arranged in a ring shape. In the display unit, the plurality of pixel columns is concentrically arranged along a plane direction of the display region, around, as a center, a reference position in the display region. In a case where a pixel column arranged at a predetermined position in the plurality of pixel columns is defined as a reference pixel column and a pixel forming the reference pixel column is defined as a reference pixel, a pixel forming a pixel column arranged on an outer side of the reference pixel column has a similar shape obtained by enlarging a shape of the reference pixel.

To provide a composite diffraction element capable of preventing nonuniformity of an image due to, for example, a bubble and improving quality. A composite diffraction element 100 includes: at least two diffraction elements 101 and 102 each having a reflection surface that reflects light; and a support body 103 placed between each of the diffraction elements 101 and 102, the support body 103 having a void 108, and each of the diffraction elements 101 and 102 are placed, facing each other across the void 108. Furthermore, in the composite diffraction element 100, the diffraction elements 101 and 102 are reflective diffraction elements, and transmit projected light while diffracting the projected light selectively. The diffraction elements 101 and 102 are volume hologram elements having protective layers 104 and 106, and photosensitive material layers 105 and 107 on each of which the reflection surface is formed.

A content sharing device for use in controlling content replicated from a video source device on a large common display screen, the content sharing device comprising a housing, a processor supported by the housing, at least first and second control buttons supported by the housing and linked to the processor, a cable linked to the processor and having a distal end opposite the processor, the cable including a connector at the distal end for linking to the video source device, wherein, the processor is programmed to enable content from the video source device linked to the connector to be replicated in a first field on the common display screen upon selection of the first control button and to enable content from the video source device linked to the connector to be replicated in a second field adjacent to and separate from the first field upon selection of the second control button.

A content sharing device for use in controlling content replicated from a video source device on a large common display screen, the content sharing device comprising a housing, a processor supported by the housing, at least first and second control buttons supported by the housing and linked to the processor, a cable linked to the processor and having a distal end opposite the processor, the cable including a connector at the distal end for linking to the video source device, wherein, the processor is programmed to enable content from the video source device linked to the connector to be replicated in a first field on the common display screen upon selection of the first control button and to enable content from the video source device linked to the connector to be replicated in a second field adjacent to and separate from the first field upon selection of the second control button.

An object is to provide an optical system capable of improving the brightness of a main image while eliminating a ghost image. In an optical system including: an image display device that emits an image; a linear polarizer through which light associated with the image passes; a first quarter wavelength plate which receives the light from the linear polarizer; a half mirror; a reflective polarizer; and a second quarter wavelength plate provided between the reflective polarizer and the half mirror, retardance of the first quarter wavelength plate and retardance of the second quarter wavelength plate are equal, and thus the object is achieved.

A co-processor module for use with a set top box including an enclosure and a processor assembly contained in the enclosure. The processor assembly can include a PCB, a processor, and a USB connector. One or more magnets extend through a wall of the enclosure and are positioned to contact a surface of the set top box when the USB connector is connected to the set top box.

A display apparatus includes: a display panel including: a display area configured to display an image, and a non-display area, at least one first sound generator in the display area, and at least one second sound generator in the non-display area, wherein each of the at least one first sound generator and the at least one second sound generator is configured to vibrate the display panel to generate sound toward a front of the display panel.

A display device includes a display panel, a mid frame disposed below the display panel and having a plurality of openings, a back plate disposed between the display panel and the mid frame and having a plurality of first patterns protruding toward the mid frame and corresponding to the plurality of openings, and a first adhesive unit disposed between the mid frame and the back plate. In one example, the first adhesive unit includes a plurality of first areas overlapping the plurality of openings, and a second area enclosing the plurality of first areas and being malleable than the first areas.

A video display device comprising; a display; an exercise amount detection sensor configured to detect an exercise amount of a viewer while the viewer is viewing content displayed and output sensor information; a timer that measures a viewing time; and a processor. The processor: acquires the viewing time from the timer; calculates the exercise amount of the viewer based on the sensor information acquired within a predetermined period of viewing time; compares the exercise amount with an exercise facilitation threshold for determining whether to facilitate exercise for the viewer; displays a specific object within a display area of the display when the exercise amount falls below the exercise facilitation threshold; and moves the specific object from an inside of the display area to an outside thereof in accordance with an external coordinate system expressing a position in a real space associated with a two-dimensional coordinate system in the display area.