Abstract: An optical element including an optically transparent lens which defines a curved surface having a steepness given by an R/# of from about 0.5 to about 1.0. A film is positioned on the curved surface. The film includes an index layer. A composite layer is positioned on the curved surface having a refractive index greater than the index layer. The composite layer includes HfO2 and Al2O3. The composite layer has a mole fraction X of HfO2, wherein X is from about 0.05 to about 0.95 and a mole fraction of Al2O3 in the composite layer is 1?X.

Abstract: An apparatus to support a display device main body to a ceiling includes a ceiling bracket connectable with the ceiling; a connecting bracket having a swivel hinge coupled with the ceiling bracket to enable the connecting bracket to swivel in a direction perpendicular to a plane of the ceiling bracket; and a supporting bracket to elastically support the display device main body to overcome a weight of the display device main body, the supporting bracket having a tilting hinge combined tiltably with the connecting bracket. Thus, an apparatus to support a display device in which swivel, pivot and tilt movements of the display device main body supported to a ceiling can be performed conveniently and the display device main body can be tilted by a relatively small force is provided.