An emerging technology can be classified in the taxonomy by the role light plays in its use and operation.
• A device may employ technology which requires a light source to display images, such as liquid crystal displays (LCDs), e-ink or OLEDs.
• Optical computing, which is still largely in theoretical stages of development, uses photons instead of electrons in logic operations.
• Digital cameras capture light to produce images.
• Optical fiber is used in a variety of applications, most notably to transmit data at high bandwidths.