| 摘要 |
A display apparatus comprises a frame adapted to engage and support the edges of a picture, a casing (3) defining a cavity disposed behind the plane occupied by the picture in use, lighting means 16, 17, 18 located in the cavity, and a power source for the lighting means. The lighting means comprising a linear array of light emitting diodes mounted in respective apertures in an elongate laminar support 16 and arranged to provide backlit illumination for a picture located in the frame. The array is located in a tubular diffuser 17 which is located in a light transmitting tube 18. The diffuser has a diameter less than the diameter of the tube and the tube is disposed along a central axis of the casing. The control circuitry and a battery compartment are enclosed by cover plates forming a channel 35 to receive the lighting means. The device further includes a photovoltaic cell, to supplement or reduce the need for a battery or external power supply, and a light sensitive detector arranged to interrupt the power circuit during light conditions. |
