COG, or Chip-On-Glass, is a type of LCD (Liquid Crystal Display) technology where the driver IC (Integrated Circuit) is mounted directly on the glass substrate, eliminating the need for a flexible printed circuit (FPC) connector. This results in a more compact and thinner LCD module, as well as improved reliability and durability due to the reduced number of components. COG is commonly used in small and portable devices such as smartphones, digital cameras, and MP3 players, where space and power efficiency are important considerations.