| 摘要 |
<p>An LED backlight module comprises a light guide plate (30), an LED lamp bar (31), a back plate (32) and a heat radiation element (33). The LED lamp bar (31) is fixed on the heat radiation element (33) with being close to the light incidence side of the light guide plate (30), the heat radiation element (33) is provided with a light guide plate positioning column (34) which is relatively fixed with the heat radiation element (33) and extends upward, the light guide plate positioning column (34) penetrates through the light guide plate (30) upward to relatively position the light guide plate (30) on the heat radiation element (33), the heat radiation element (33) is movably arranged on the back plate (32) along the light incidence direction, and the heat radiation element (33) shifts along with the expansion or contraction of the light guide plate (30) so as to maintain the light coupling distance between the light guide plate (30) and the LED lamp bar (31). The LED backlight module can avoid the warp of the light guide plate (30) caused by mechanism interference after the light guide plate (30) is expanded by heating or moisture absorption, can avoid the light guide plate (30) from being collided with the LED after the light guide plate (30) is expanded by heating or moisture absorption so as to avoid the LED failure, and can further ensure the light coupling distance between the light guide plate (30) and the LED, thus improving the light coupling efficiency.</p> |
