Chip-on-Glass (COG) is an assembly technology in which a microchip, usually the display driver, is placed directly on the glass surface of the LCD panel. Instead of using a separate PCB, the chip is attached and electrically connected to transparent conductive traces on the glass, which reduces device size and simplifies its construction.
COG reduces the number of intermediate components, lowers the module height and minimizes potential failure points. Integrating the controller with the panel shortens signal paths, improving the stability and quality of data transmission. COG is used in thin, small-diagonal LCD-TFT displays, such as those in digital watches, calculators, HMI terminals and portable medical devices.
