QTD-402, a 21.5” widescreen ultra-slim LED monitor, revolutionizes the way a monitor is made with the “smart panel” concept. Rather than using a back cover, the back of the “smart panel” becomes the cover itself, thus reducing the panel’s thinness to 0.97 cm only and the numbers of tooling needed. The use of metal material makes it easier to recycle, increasing this energy-saving LED monitor’s greenness. The visual contrasts, formed by the square body and curved stand, and different materials used on both the front and back sides also add to the esthetical beauty delivered by the slim and sleek look.