To provide a display device capable of surely preventing malfunction of various electronic equipment caused by unwanted infrared light radiated from a light emitting part of a light source.

The display device (liquid crystal display device or the like) is equipped with: the light source (CCFL or the like) of which the light emitting part radiates visible light and infrared light; and a display surface from which the light radiated from this light source is made to exit, wherein a substance containing at least one kind of rare-earth elements selected from a group consisting of scandium, yttrium, lanthanum, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium is prepared between the light emitting part of the light source and the display surface, and/or on the display surface.

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