Abstract: A contrast enhancement filter is produced by photographic reproduction of a master filter on to positive color transparency film. The master filter may be a multilayer thin film optical filter. The developed positive color transparency film may be laminated between a pair of glass sheets with layers of an ultraviolet absorbing polymer material.

Abstract: Ophthalmic anti-reflection coating for use on spectacles with lenses having an eye side and an outside. A first coating is disposed on the eye side of each lens and the second coating is disposed on the outside of each lens. The first and second coatings are formed of a metal layer and a dielectric layer having a low index of refraction. The metal layer in the first coating is adjacent the lens on the eye side and the dielectric layer in the second coating is adjacent the lens on the outside.

Abstract: Coated architectural glass system having a transparent substrate with a surface and a multi-layer coating disposed on the surface. The multi-layer coating comprises first and second metal layers and a dielectric layer disposed between the first and second metal layers. The first and second metal layers have a thickness ratio so that the transmission of the coating can be changed independent of its reflection properties, by varying the thickness of the metal layers while maintaining the ratio constant. The dielectric has a thickness such that the reflection from the coating is not strongly colored in the region of 400 millimicrons to approximately 700 millimicrons. In the method, the transmission of the coating can be changed merely by varying the thickness of the first and second metal layers in accordance with a thickness ratio.

Abstract: Display device which changes colors which has first and second spaced members with the first member being formed of an insulating material and being capable of transmitting light. Means is disposed between the first and second members for diffusing light. Means is carried by the second member which is capable of reflecting light. Means is provided on the first member which is capable of transmitting a certain spectral region of the light beam and for reflecting another spectral region of the light beam so that when the light beam passes through the means disposed between the first and second members and certain of the light is diffused, a color is imparted to the eye of the viewer.

Abstract: Liquid crystal display device having first and second substantially transparent insulative plates having front and rear surfaces with said plates being arranged so that the rear surface of the first plate and the front surface of the second plate face each other. An antireflection coating is disposed on at least one of said front and rear surfaces of said front plate. A conducting coating is carried on said rear surface of said first plate and said front surface of said second plate. Means secures the first plate to the second plate so that there is a space provided between said conductive layers. A layer of liquid crystal material is disposed in said space.In the method, an antireflection coating is provided on a surface so that the pattern carried by the display device is invisible when the display device is not activated.