| 摘要 |
<p>A direct-type backlight (30) for a liquid crystal display (28) used in a television set (100) and comprising a diffuser (53), fluorescent tubes (51) mounted in a tray-like reflective plate (50b) which is held in a frame (50a). The spacing of the fluorescent tubes, which are arranged essentially parallel to one another, as seen by the viewer, gradually increases from the centre of the backlight towards its edges. Furthermore, the florescent tubes in the centre of the backlight are bent closer to the diffusion plate (in a so-called "chevron" shape) whereas those at the edge of the display remained straight. The florescent tubes are arranged in sets of two adjacent tubes, which are connected together (56a-d) at one side of the backlight to form elongated U-shaped lamp structures. AC power connections to these lamp structures (57a-d) are arranged at the opposite side of the backlight to the "U" connections. In addition, the reflective plate exhibits a protrusion (58) which follows the curvature of the fluorescent tubes in the centre of the backlight, so that the reflective plate is also lacated closer to the diffuser at the centre of the backlight. This lamp arrangement allows the brightness of the backlight to be increased at its centre compared with at its edges, giving the viewer the impression that the image quality of the display is better.</p> |
