An omnidirectional ultra-wideband monopole antenna, with the characteristics of simple structure, easy fabrication and low cost, mainly comprises a ground plane, a U-shaped radiating member above the ground plane and a feeding member for feeding signals to the radiating member. The illumination unit generates luminescence light as background illumination for the display. The seal bonds the first and second substrates together, and the ridge maintains the liquid crystal over the TFT array. The suction device has at least two fans which are each provided with their own outlet opening.