What do LCD screens and LCD modules, COG and COB refer to?
Feb 08, 2023| LCD is the abbreviation for Liquid Crystal Display, and LCM is an abbreviation for LCD module.
The difference between the LCD module and the LCD screen is that the LCD screen is a component of the module. The liquid crystal module refers to a component that assembles the liquid crystal screen, connectors, peripheral circuits such as control and drive, PCB circuit board, backlight, structural parts, and so on.
LCD modules usually refer to small-sized LCD screens, and large-sized LCD screens with controls are usually not called modules but are called display screens or LCD screens.
The liquid crystal module is divided according to the type of process: it can be mainly divided into two types: COB (Chip On Board) liquid crystal module and COG (chip on glass) liquid crystal module.
COG
COG is the abbreviation of "Chip On Glass" in English, that is, the chip is directly bonded to the glass through ACF (Anisotropic Conductive Film). This installation method can greatly reduce the size of the entire LCD module and is lower cost than the TAB method, it is easy to mass-produce. It is suitable for LCDs used in consumer electronics products, such as portable electronic products such as mobile phones, PDAs, and MP3s. Driven by IC manufacturers, this installation method is the main connection method between IC and LCD today.
COB is the abbreviation of "Chip On Board" in English, that is, the chip is bonded (Bonding) on the PCB, which can greatly reduce the size of the module, and at the same time reduce the cost in terms of price. Since IC manufacturers are reducing the output of QFP (a type of SMT IC with pins on all four sides) packages in the production of LCD control and related chips, the traditional SMT method will be replaced in future products. Gradually replaced.