3M's engineered films serve a vast multitude of uses. One product line enhances the brightness in LCD displays while another blocks the sun from coming through windows. 3M films are used to create building-sized graphics and to prevent graffiti. Some are single-layered with humble applications and others combine hundreds of layers that are tuned to transmit or reflect specific wavelengths. Still other films provide very high barriers to oxygen and moisture-a requirement in next-generation electronic displays.